The Lenovo ThinkSystem SR655 is a 1-socket 2U server that features the new AMD EPYC 7002 "Rome" family of processors. With up to 64 cores per processor and support for the new PCIe 4.0 standard for I/O, the SR655 offers the ultimate in single-socket server performance. With up to 128 PCIe lanes, the server is ideal for workloads that can take advantage of GPU processing and high-performance NVMe drives.

Suggested uses: AI Inference, VDI, OLTP, Analytics, software-defined storage

Figure 1. Lenovo ThinkSystem SR655

By using a high-performance server with only one processor installed, you can take advantage of lower software costs when the software licensing is using a per-socket model.

The SR655 has been designed to take advantage of the features of the EPYC 7002 "Rome" processors, such as the full performance of 225W 64-core processors, support for 3200 MHz memory and PCIe Gen 4.0 support. Competitive servers that are based on the older EPYC 7001 "Naples" designs may not be able to offer these performance features.

Combining performance and flexibility, the SR655 server is a great choice for enterprises of all sizes. The server offers a broad selection of drive and slot configurations and offers high performance features that industries such as finance, healthcare and telco need. Outstanding reliability, availability, and serviceability (RAS) and high-efficiency design can improve your business environment and can help save operational costs.

Scalability and performance

The SR655 offers numerous features to boost performance, improve scalability and reduce costs: 

• Supports the new AMD EPYC 7002 family of processors
• Supports processors with up to 64 cores and 128 threads, core speeds of up to 3.2 GHz, and TDP ratings of up to 225W.
• Support for up to 16 TruDDR4 memory DIMMs, with 8 memory channels and 2 DIMMs per channel. With 1 DIMM installed per channel (8 DIMMs total), memory operates at up to 3200 MHz. With 2 DIMMs per channel (16 DIMMs total), memory operating at up to 2933 MHz.
• Using 128GB 3DS DIMMs, the server supports up to 2TB of system memory.
• Supports 3 double-width GPUs up to 300W each, or 6 single-width GPUs up to 75W each. A 6:1 ratio of GPUs to CPUs means substantial processing power is available with just one CPU.
• Supports up to 32x 2.5-inch hot-swap drive bays, by using combinations of front-accessible (up to 24 bays), mid-accessible (up to 8), and rear-accessible (up to 4) drive bays.
• Supports 3.5-inch drive bays for lower-cost high-capacity storage. 2.5-inch and 3.5-inch drive bays can be mixed in several combinations.
• Supports 16x SATA drives using the onboard SATA controller (no additional adapter needed), enabling lower cost, high capacity storage solution for cold storage workloads.
• Supports up to 28x NVMe drives without oversubscription of PCIe lanes (1:1 connectivity), or up to 32x NVMe drives with a 2:1 oversubscription. The use of NVMe drives maximizes drive I/O performance, in terms of throughput, bandwidth, and latency.
• Supports high-speed RAID controllers from Broadcom providing 12 Gb SAS connectivity to the drive backplanes. A variety of RAID adapters are available, with cache and support for up to 24 drives on a single controller.
• Supports M.2 drives for convenient operating system boot functions or data storage. Available M.2 adapters support either one M.2 drive or two M.2 drives in a RAID 1 configuration for performance and reliability.
• The server has a dedicated industry-standard OCP 3.0 small form factor (SFF) slot, with a PCIe 4.0 x16 interface, supporting a variety of Ethernet network adapters. Simple-swap mechanism with thumbscrews and pull-tab enables tool-less installation and removal of the adapter. Supports shared BMC network sideband connectivity to enable out-of-band systems management.
• The server offers PCI Express 4.0 I/O expansion capabilities that doubles the theoretical maximum bandwidth of PCIe 3.0 (16GT/s in each direction for PCIe 4.0, compared to 8 GT/s with PCIe 3.0). A PCIe 4.0 x16 slot provides 64 GB/s bandwidth, enough to support a 400GbE network connection.
• A total of up to 9 PCIe 4.0 slots (8 with rear access, 1 internal for a RAID adapter) plus a slot dedicated to the OCP adapter.

Availability and serviceability

The SR655 provides many features to simplify serviceability and increase system uptime:

• The server uses ECC memory and supports memory RAS features including Single Device Data Correction (SDDC, also known as Chipkill), Patrol/Demand Scrubbing, DRAM Address Command Parity with Replay, and DRAM Uncorrected ECC Error Retry.
• The server offers hot-swap drives, supporting RAID redundancy for data protection and greater system uptime.
• The M.2 SATA RAID Boot Adapter supports RAID-1 which enables two installed M.2 drives to be configured as a redundant pair.
• The server has up to two hot-swap redundant power supplies and six hot-swap redundant fans to provide availability for business-critical applications.
• The power-source-independent light path diagnostics uses LEDs to lead the technician to failed (or failing) components, which simplifies servicing, speeds up problem resolution, and helps improve system availability.
• Solid-state drives (SSDs) offer more reliability than traditional mechanical HDDs for greater uptime.
• The built-in ASPEED AST2500 baseboard management controller (BMC) continuously monitors system parameters, triggers alerts, and performs recovery actions in case of failures to minimize downtime.
• Proactive Platform Alerts: Voltage regulators, memory, fans, power supplies, server ambient and subcomponent temperatures. Alerts can be surfaced through the BMC to managers such as Lenovo XClarity Administrator. These proactive alerts let you take appropriate actions in advance of possible failure, thereby increasing server uptime and application availability.
• Web-based ThinkSystem System Manager (TSM) provides remote access to the BMC for remote management.
• Lenovo XClarity Provisioning Manager Lite (LXPM Lite) tool can be used to install an operating system on the server and perform system diagnostics.
• Three-year or one-year customer-replaceable unit and onsite limited warranty, 9 x 5 next business day. Optional service upgrades are available.

Manageability and security

Systems management features simplify local and remote management of the SR655:

• Supports Lenovo XClarity Provisioning Manager Lite (LXPM Lite) for system setup and firmware upgrades.
• An integrated industry-standard Unified Extensible Firmware Interface (UEFI) enables improved setup, configuration, and updates, and simplifies error handling.
• Support for industry standard management protocols, IPMI 2.0, SNMP 3.0, Redfish REST API, serial console via IPMI
• An integrated hardware Trusted Platform Module (TPM) supporting TPM 2.0 enables advanced cryptographic functionality, such as digital signatures and remote attestation.
• Administrator and power-on passwords help protect from unauthorized access to the server.
• Support for Lenovo XClarity Energy Manager, which captures real-time power and temperature data from the server and integrates with Redfish-based applications to provide automated controls to lower energy costs.
• Supports AMD Secure Root-of-Trust, Secure Run and Secure Move features to minimize potential attacks and protect data as the OS is booted, as applications are run and as applications are migrated from server to server.
• Supports Secure Boot to ensure only a digitally signed operating system can be used.
• Industry-standard Advanced Encryption Standard (AES) NI support for faster, stronger encryption.

Energy efficiency

The SR655 offers the following energy-efficiency features to save energy, reduce operational costs, and increase energy availability:

• Energy-efficient planar components help lower operational costs.
• High-efficiency power supplies with 80 PLUS Platinum and Titanium certifications
• Low-voltage 1.2 V DDR4 memory offers energy savings compared to 1.35 V and 1.5 V DDR3 DIMMs.
• Solid-state drives (SSDs) consume as much as 80% less power than traditional spinning 2.5-inch HDDs.
• The server uses hexagonal ventilation holes, which can be grouped more densely than round holes, providing more efficient airflow through the system and thus keeping your system cooler.
• Optional Lenovo XClarity Energy Manager provides power and thermal monitoring to help achieve lower heat output and reduced cooling needs.

The following figure shows the architectural block diagram of the SR655, showing the major components and their connections.

Figure 5. SR655 system architectural block diagram

* Riser 1 has a x16 system board connection. For 32 lanes, the riser receives 16 lanes from two x8 onboard slimline connectors via cables
** Riser 3 and Internal slot are connected to onboard connectors; no system board slots

The following table lists the standard specifications.

Models of the SR655 are defined based on whether the server has 2.5-inch drive bays at the front (called the 24x 2.5" chassis) or whether it has 3.5-inch drive bays at the front (called the 12x 3.5" chassis). For models, the feature codes for these chassis bases are as listed in the following table.

The following tables list the available models, grouped by region.

• Models for Australia and New Zealand
• Models for South East Asian countries (ASEAN)
• Models for Brazil
• Models for EMEA countries
• Models for Hong Kong, Taiwan, Korea (HTK)
• Models for India
• Models for Japan
• Models for Latin American countries (except Brazil)
• Models for USA and Canada

Refer to the Specifications section for information about standard features of the server.

The SR655 supports processors in the second-generation AMD EPYC family of processors. The server supports one processor.

The table below lists the supported AMD processors.

All supported processors have the following characteristics:

• Second-generation AMD EPYC processors (formerly codenamed "Rome")
• 7 nm process technology
• Eight DDR4 memory channels
• 128 PCIe 4.0 I/O lanes

Processor features

The following table lists the features of the supported processors.

† The maximum single-core frequency at with the processor is capable of operating

The server uses Lenovo TruDDR4 memory operating at up to 3200 MHz. The processors have 8 memory channels and support 2 DIMMs per channel, for a total of 16 DIMMs.

The server supports up to 2TB of memory using 16x 128 GB 3DS RDIMMs.

The server supports these memory DIMMs:

• 2933 MHz DIMMs, that operate at 2933 MHz both at 1 DIMM per channel and 2 DIMMs per channel
• 3200 MHz DIMMs, that operate at 3200 MHz at 1 DIMM per channel, and at 2933 MHz at 2 DIMMs per channel

Note that if the processor selected has a memory bus speed of 2666 MHz, then all DIMMs will operate at 2666 MHz, even if the DIMMs are rated for a higher speed MHz.

The following table lists the memory options that are available for the server.

Lenovo TruDDR4 memory uses the highest quality components that are sourced from Tier 1 DRAM suppliers and only memory that meets the strict requirements of Lenovo is selected. It is compatibility tested and tuned to maximize performance and reliability. From a service and support standpoint, Lenovo TruDDR4 memory automatically assumes the system warranty, and Lenovo provides service and support worldwide.

The following rules apply when selecting the memory configuration:

• The server supports RDIMMs and 3DS RDIMMs
• Mixing of RDIMMs and 3DS RDIMMs is not supported
• Mixing of DIMM vendor is supported, but not in the same channel (see the table above)
• Mixing x4 and x8 DIMMs is supported, but not in the same channel
• Mixing of DIMM rank counts is supported. Follow the required installation order installing the DIMMs with the higher rank counts first.
• Mixing of DIMM capacities is supported, however only two different capacities are supported all channels of the processor (eg 32GB and 64GB). Follow the required installation order installing the larger DIMMs first.
• Mixing of 3200 MHz and 2933 MHz DIMMs is supported, but not in the same channel
• Memory mirroring and memory rank sparing are not supported.

For best performance, consider the following:

• Ensure the memory installed is at least the same speed as the memory bus of the selected processor.
• Populate memory DIMMs in quantities of 8 or 16, so that all memory channels are used.
• Populate memory channels so they all have the same total memory capacity.

The following memory protection technologies are supported:

• ECC detection/correction
• SDDC (for x4-based memory DIMMs; look for "x4" in the DIMM description)
• Patrol/Demand Scrubbing
• DRAM Address Command Parity with Replay
• DRAM Uncorrected ECC Error Retry
• Post Package Repair

The SR655 supports up to 20x 3.5-inch or 32x 2.5-inch drive bays, depending on the selected chassis and backplane configuration. Drives can be all SAS, all SATA, or all NVMe, or combinations of all three (not in the same RAID array, if configured). The server also supports configurations without any drive bays if desired.

All drives are hot-swap and are accessible from the front, from the rear, or from drive bays that are located in the middle of the server (accessible when you remove the top cover of the server).

The three drive zones are as follows:

• Front: up to 12x 3.5-inch or 24x 2.5-inch, hot-swap bays
• Mid (internal): up to 4x 3.5-inch or 8x 2.5-inch, hot-swap bays
• Rear: up to 4x 3.5-inch or 4x 2.5-inch hot-swap bays

The server also supports one or two M.2 drives, installed in an M.2 adapter.

In this section:

• NVMe drive support
• Front drive bays
• Mid drive bays
• Rear drive bays
• Supported drive bay combinations
• Adapters selections
• Field upgrades
• M.2 drives

NVMe drive support

The SR655 supports NVMe drives to maximize storage performance, as follows:

• Up to 28 NVMe drives without oversubscription (that is, each x4 drive has a full x4 (4 lanes) connection to the processor)
  • 24 NVMe drives in the front bays
  • 4 NVMe drives in the rear bays
• Up to 32 NVMe drives with a 2:1 oversubscription (that is, each x4 drive has a x2 connection (2 lanes) to the processor)
  • 24 NVMe drives in the front bays
  • 8 NVMe drives in the mid bays
• Up to 4x NVMe drives in a 3.5-inch drive configuration
  • All installed in front bays

The specifics of these configurations plus other NVMe-rich configurations are covered in the Supported drive bay combinations and  Adapters selections sections.

Front drive bays

The front drive bay zone supports the following configurations:

• 3.5-inch drive bays
  • No drives and no backplane (supports field upgrades)
  • 8x 3.5-inch SAS/SATA (no upgrades)
  • 12x 3.5-inch SAS/SATA (no upgrades)
  • 8x 3.5-inch SAS/SATA + 4x 3.5-inch AnyBay (AnyBay supports SAS or SATA or NVMe drives) (no upgrades)
• 2.5-inch drive bays
  • No drives and no backplane (supports field upgrades)
  • 8x 2.5-inch SAS/SATA (supports field upgrades to 16 or 24 drives)
  • 16x 2.5-inch SAS/SATA (supports field upgrades to 24 drives)
  • 24x 2.5-inch SAS/SATA (no upgrades)
  • 8x 2.5-inch NVMe (supports field upgrades to 16 or 24 drives)
  • 16x 2.5-inch NVMe (supports field upgrades to 24 drives)
  • 24x 2.5-inch NVMe (no upgrades)
  • 8x 2.5-inch NVMe + 8x 2.5-inch SAS/SATA (supports upgrade to 16x SAS/SATA)
  • 8x 2.5-inch NVMe + 16x 2.5-inch SAS/SATA (no upgrades)

These configurations are shown in the following figure.

Figure 6. SR655 front drive bay configurations

The backplanes used to provide these drive bays are listed in the following table.

* Backplanes are available as part numbers for field upgrades using upgrade kits, as described in the Field upgrades section below.
† AnyBay bays support SAS or SATA or NVMe drives

The use of NVMe drives may limit the use of PCIe slots or M.2 drives as described in the I/O expansion section.

Mid drive bays

The SR655 supports hot-swap drives installed in the middle of the server chassis. The drive bays are accessible by removing the top lid of the server and levering the mid drive chassis.

The following configurations are supported:

• 4x 3.5-inch hot-swap SAS/SATA drive bays
• 8x 2.5-inch hot-swap SAS/SATA drive bays
• 8x 2.5-inch hot-swap NVMe drive bays

The drive bays in the open position are shown in the following figure.

Figure 7. Mid-chassis drive bays

The backplanes used to provide these drive bays are listed in the following table.

* Backplanes are available as part numbers for field upgrades using upgrade kits, as described in the Field upgrades section below.
‡ 2.5-inch drive backplanes for the mid-chassis area must be installed in pairs. NVMe and SAS/SATA cannot be mixed.

The use of drive bays in the mid-chassis area has the following configuration rules:

• Processors with TDP higher than 155W are not supported
• Full-length adapter cards are not supported
• GPUs (including low profile GPUs such as the T4) are not supported
• If 2.5-inch mid-chassis drive bays are configured then rear drive bays are not supported. See the Supported drive bay combinations section for more information.
• The use of NVMe drives in the mid bays requires to use of a PCIe retimer or switch

Rear drive bays

The SR655 supports hot-swap drives installed at the rear of the server chassis. Supported configurations are as follows:

• 4x 3.5-inch hot-swap SAS/SATA drive bays
• 4x 2.5-inch hot-swap SAS/SATA drive bays
• 4x 2.5-inch hot-swap NVMe drive bays

The configurations are shown in the following figure.

Figure 8. Rear drive bay configurations

The backplanes used to provide these drive bays are listed in the following table.

* Backplanes are available as part numbers for field upgrades using upgrade kits, as described in the Field upgrades section below.

The use of rear drive bays has the following configuration rules:

• Slots 7 and 8 are not available
• GPUs are not supported
• If 3.5-inch rear drive bays are configured then only slots 3 and 6 are available, as described in the I/O expansion section
• The use of NVMe drives in rear bays requires to use of a PCIe retimer or switch

3.5-inch drive bay chassis

The following table shows the supported combinations when the server is configured with a 3.5-inch chassis (where the front drive bays are 3.5-inch). In this configuration:

• When the front bays are 3.5-inch bays, the mid bays are also 3.5-inch bays, however the rear zone can be either 2.5-inch SAS/SATA or 3.5-inch SAS/SATA
• NVMe is only supported in the front bays, using the AnyBay backplane (which offers 4x NVMe-capable drive bays)

The choice of storage controller for each configuration is listed in the Adapter selections section.

2.5-inch drive bay chassis

The server has 36 drive bays in total, however up to 32 drives are supported in a configuration.

The following table shows the supported combinations when the server is configured with a 2.5-inch chassis (where the front drive bays are 2.5-inch). In this configuration:

• With the 2.5-inch chassis, all drive bays are 2.5-inch bays. No 3.5-inch drives are supported with the 2.5-inch chassis.
• Mid bays and Rear bays cannot be used concurrently

The choice of storage controller for each configuration is listed in the Adapter selections section.

Adapter selections

The following tables lists the supported drive bay combinations plus the list of supported controller combinations supported by each of those drive bay combinations. Information about the controllers can be found in the Controllers for internal storage section.

General rules for adapters:

• The RAID 730-8i 1G cannot be used for connection to the rear drive bays
• Only the RAID 530-8i or the 430-8i HBA can be selected when a separate controller is needed for the rear drive bays
• The RAID 730-8i 2G cannot be used in the same server as the RAID 730-8i-1G or RAID 930-8i
• The M.2 Adapter is not supported in configurations of 16 or more 2.5-inch NVMe drives in the front bays
• For performance reasons, select the 1610-4P NVMe switch adapter instead of the 810-4P NVMe switch adapter, when available

* The use of the 810-4P results in PCIe lane oversubscription. For better NVMe drive performance without oversubscription, use a 1610-4P instead (not supported in configuration T)

† AnyBay bays support SAS or SATA or NVMe drives

If you plan to add one of the RAID adapters that includes a Flash power module (supercap) as a field upgrade, then you will also need to order a Supercap installation kit for the power module. For CTO orders, the components in the installation kit are automatically derived when you select the RAID adapter. The adapters that this applies to are as follows:

• ThinkSystem RAID 730-8i 2GB Flash PCIe 12Gb Adapter
• ThinkSystem RAID 930-8i 2GB Flash PCIe 12Gb Adapter
• ThinkSystem RAID 930-16i 4GB Flash PCIe 12Gb Adapter
• ThinkSystem RAID 930-24i 4GB Flash PCIe 12Gb Adapter

The power module installation kit list listed in the following table.

The following figure shows the location and use of the components of the option kit.

Figure 9. Supercap Installation Kit

If your existing server is configured with drive backplanes that are connected to onboard SATA ports and you wish to upgrade to a RAID adapter or SAS HBA, you will need to order the cable kit listed in the following table along with the adapter(s). The cable kit includes the additional cables you will need to connect the existing backplane to the new adapter. Note that the kit includes the cables needed for all supported combinations of backplanes; this means that some of the cables in the kit will not be used.

The cables in the kit are used with existing backplanes as listed in the following table.

Supported drives are listed in the Internal drive options section.

The SATA RAID Enablement Kit has the following features:

• Supports one or two SATA M.2 drives
• Support 42mm, 60mm and 80mm drive form factors (2242, 2260 and 2280)
• RAID support via an onboard Marvell 88SE9230 SATA RAID Controller
• Support JBOD, RAID-0 and RAID-1 (RAID support requires two M.2 drives)
• PCIe 2.0 x2 host interface; 6Gbps SATA connection to the drives
• Management and configuration support via UEFI and OS-based tools
• Supports monitoring and reporting of events and temperature through I2C
• Firmware update via Lenovo firmware update tools

The SATA/NVMe Enablement Kit has the following features:

• Supports one or two M.2 drives, either SATA or NVMe
• When two drives installed, they must be either both SATA or both NVMe
• Support 42mm, 60mm and 80mm drive form factors (2242, 2260 and 2280)
• JBOD support only; no RAID support
• Either 6Gbps SATA or PCIe 3.0 x4 interface to the drives depending on the drives installed
• Supports monitoring and reporting of events and temperature through I2C
• Firmware update via Lenovo firmware update tools

For further details about M.2 components, see the ThinkSystem M.2 Drives and M.2 Adapters product guide:
https://lenovopress.com/lp0769-thinksystem-m2-drives-adapters

The SR655 offers a variety of controller options for internal drives:

• Onboard SATA ports for up to 16 SATA drives
• RAID adapters and HBAs for SAS/SATA drives
• Onboard NVMe ports (for up to 16 NVMe drives)
• NVMe adapters for configurations of 20 or more NVMe drives

The following table lists the adapters used for the internal storage of the server.

* The RAID 730-8i 1GB Cache adapter is not available in USA and Canada.
** When 4x3.5" rear drive bays are configured, the 930-24i can only be installed in slot 3. When 4x2.5" rear drive bays are configured, the 930-24i can only be installed in slots 1 or 2.

The following two tables compare the functions of the storage adapters.

The following tables list the hard disk drive and solid-state drive options for the internal disk storage of the server.

• Table 30: 2.5-inch hot-swap 12 Gb SAS HDDs
• Table 31: 2.5-inch hot-swap 6 Gb SAS/SATA HDDs
• Table 32: 2.5-inch hot-swap 12 Gb SAS SSDs
• Table 33: 2.5-inch hot-swap 6 Gb SAS/SATA SSDs
• Table 34: 2.5-inch U.2 NVMe SSDs
• Table 35: 3.5-inch hot-swap 12 Gb SAS HDDs
• Table 36: 3.5-inch hot-swap 6 Gb SAS/SATA HDDs
• Table 37: 3.5-inch hot-swap 12 Gb SAS SSDs
• Table 38: 3.5-inch hot-swap 6 Gb SAS/SATA SSDs
• Table 39: 3.5-inch NVMe SSDs
• Table 40: M.2 drives

* Toshiba CM5-V, Intel P4610 and Intel P4510 drives are 15mm high drives and are only supported in the front drive bays due to thermal requirements

The server does not supports any internal backup units, such as tape drives or RDX drives. External backup units are available as described in the External backup units section.

The server does not supports an internal optical drive. An external USB optical drive is available, listed in the following table.

The server supports a total of up to 9 PCIe 4.0 slots (8 with rear access, 1 internal for a RAID adapter or HBA) plus a dedicated OCP 3.0 SFF slot for networking. Slot availability is based on riser selection.

Slot length is dependent on the use of a mid-chassis drive cage: If the mid drive cage is present then slots are half-length; if the mid drive cage is not present, then slots are full-length.

The following figure shows the locations of the rear-accessible slots for each configuration selection. The OCP slot in located in the lower-left corner.

Figure 10. SR655 slots

The slots and riser cards are as follows:

• Riser 1: Slots 1, 2 and 3 - all FHHL or FHFL (16 or 32 lanes)
  • Option 1*: x16, x8, x8 (all physically x16 slots)
  • Option 2*: x16, x16, NC (slot 3 not connected)
  • Option 3: NC, NC, x16 (1U riser; slot 1 and slot 2 not connected)
  • Option 4: x16, NC, NC (slot 2 and slot 3 not connected)
• Riser 2: Slots 4, 5, and 6 - slot size varies (32 lanes)
  • Option 1: x16, x8, x8 (all physically x16 slots)
  • Option 2: x16, x16, NC (slot 6 not connected)
  • Option 3: NC, NC, x16 (1U riser; slot 4 and slot 5 not connected)
• Riser 3: Slots 7 and 8 - both FHHL or FHFL (16 or 32 lanes)
  • Option 1*: x8, x8 (both physically x16 slots)
  • Option 2*: x16, x16
• Slot 9: Internal PCIe 4.0 x8 low-profile slot for internal drive controller (physically a x16 slot)*

* The use of 32 lanes with Riser 1 or the use of Riser 3 or Slot 9 imposes restrictions on the use of the onboard SATA controller or the use of the M.2 Module or both. See Table 43 below for details.

The riser cards used to provide the above slot combinations are listed in the following table.

* Option part number 4XH7A09842 includes the GPU power cable
** Option part number 4XH7A09843 includes a bracket to hold two RAID adapter flash power modules (supercaps)

As described in this section, the use of some risers results in limitations on the use of NVMe drives, the onboard SATA controller, and M.2 drives. This is due to the dual use of some of the PCIe slimline connectors on the system board - use with riser cards and use with these other functions. The following table summarizes the restrictions.

The server has a dedicated OCP 3.0 SFF slot with PCIe 4.0 x16 host interface. See Figure 3 for the location of the OCP slot.

The following table lists the supported OCP adapters. One port can optionally be shared with the ASPEED management processor for Wake-on-LAN and NC-SI support. Only 1 OCP card can be installed in the server.

Some larger configurations of front drive bays limit whether a 10Gb or faster OCP adapter can be installed or whether performance fans must be installed. Details are listed in the following table. See the Cooling section for performance fan ordering information.

For more information, including the transceivers and cables that each adapter supports, see the list of Lenovo Press Product Guides in the Networking adapters category:
https://lenovopress.com/servers/options/ethernet

The following table lists additional supported network adapters that can be installed in the regular PCIe slots.

† Broadcom 57454 10/25GbE SFP28 4-port PCIe Ethernet Adapter is currently only supported CTO, not supported as a field upgrade option
* For these 100Gb and 200Gb adapters, high performance cooling fans must be installed. See the Cooling section for details.

For more information, including the transceivers and cables that each adapter supports, see the list of Lenovo Press Product Guides in the Networking adapters category:
https://lenovopress.com/servers/options/ethernet

The following table lists the Fibre Channel HBAs supported by the SR655.

For more information, see the list of Lenovo Press Product Guides in the Host bus adapters category:
https://lenovopress.com/servers/options/hba

The following table lists SAS HBAs and RAID adapters supported by SR655 server for use with external storage.

Configuration rules

The following configuration rules apply to the use of the RAID 930-8e adapter and the flash power module (supercaps) that each adapter requires:

• If the 3.5-inch mid-chassis drive cage is configured, then the maximum number of flash power modules (and therefore the maximum number of 930-8e adapters) is 2
• If one or more GPUs are installed, then the maximum number of flash power modules and 930-8e adapters is 3.
• If any internal RAID adapters with flash power modules are installed, the maximum number of 930-8e adapters supported is further reduced by that number.

For more information, see the list of Lenovo Press Product Guides in the Host bus adapters and RAID adapters categories:
https://lenovopress.com/servers/options/hba
https://lenovopress.com/servers/options/raid

The following table compares the specifications of the external SAS HBAs and RAID adapters.

* SAS HBAs support SEDs (self-encrypting drives) by using software on the server and simply passing SED commands through the HBA to the drives. SED support by RAID controllers is provided using the built-in MegaRAID SafeStore functionality of the adapter.

All PCIe Flash Storage adapters supported by the server are withdrawn from marketing.

The SR655 supports the following graphics processing units (GPUs).

* When installed, the adjacent slot (2, 5, or 8 respectively) will not be usable

For information about these GPUs, see the ThinkSystem GPU Summary, available at:
https://lenovopress.com/lp0768-thinksystem-thinkagile-gpu-summary

The following figure shows the slots where double-wide (top image) and single-wide (bottom) are installed.

Figure 11. Slots used for GPUs

Configuration rules

The following configuration requirements must be met when installing GPUs:

• All GPUs installed must be identical
• Double-wide GPUs are installed in the top slots of each riser (see I/O expansion for the location of the risers and slots).The adjacent slots are not available for use.
• Rear drive bays and mid-chassis drive bays are not supported.
• Maximum of 8x 3.5-inch front drive bays supported (12 bays not supported)
• Maximum of 16x 2.5-inch front drive bays supported (24 bays not supported)
• Flash storage adapters are not supported.
• 1600W power supplies (or in some configurations, 1100W power supplies) are required.
• Processor TDP and ambient temperature limitations are listed in the following table.

When GPUs are installed, the necessary riser cards will be derived. The following table shows the riser cards for double-wide GPUs. In such a configuration, slots 1, 4, 7 are x16 used by the GPUs, slots 2, 5, 8 are inaccessible. The remaining slots 3 and 6 are available for x8 adapters.

The following table shows the riser cards for single-wide GPUs. With 6 GPUs installed, slots 1, 2, 4, 5, 7, 8 are x16 slots used by the GPUs. The remaining slots 3 and 6 are not connected.

GPU field upgrades

When ordering GPUs as part of a CTO configuration, the necessary cooling features are automatically selected as part of the order. However when ordering the GPUs as field upgrades, you will need to also order the necessary thermal kit. One part number is needed per server.

• 4H47A38664 is for NVIDIA T4 upgrades
• 4H47A38663 is for all other GPU upgrades

The SR655 server has six 60 mm hot-swap fans and either 5 or 6 fans are standard depending on the configuration. The server offers N+1 redundancy, meaning that one fan can fail and the server still operates normally. The server also has one additional fan integrated in each of the two power supplies.

Under all of the following conditions, only 5 fans are required:

• No M.2 Module
• No internal riser slot
• No mid drive bays
• No GPUs
• No flash storage adapter
• No OCP adapter
• No Ethernet adapter of 10 GbE or higher is installed in slot 7 or 8

For all other configurations, all 6 fans are required.

Some configurations, such as the use of high-TDP processors or the addition of mid drive bays, rear drive bays, GPUs, flash storage adapters, M.2 drives, or Ethernet adapters of 100 GbE or higher, will require the use of higher-RPM performance fans and an upgraded processor heatsink. For configure-to-order builds, the DCSC configurator will automatically select the required components. For field upgrades, the option part numbers may include the upgraded components when they are needed, or you may need to order the performance fans separately.

See these sections for details:

• Drive bay upgrade kits
• OCP adpaters
• GPU upgrade kits
• Flash storage adapters
• PCIe network adapters

The server supports up to two redundant hot-swap power supplies.

The power supply choices are listed in the following table. Both power supplies used in server must be identical.

Dual-voltage power supplies are auto-sensing and support both 110V AC (100-127V 50/60 Hz) and 220V AC (200-240V 50/60 Hz) power. For China customers, all power supplies support 240V DC.

Power supply options do not include a line cord.

For server configurations, the inclusion of a power cord is model dependent. Configure-to-order models can be configured without power cords if desired.

The server supports booting from an operating system or hypervisor installed on an M.2 solid-state drive. See the M.2 drives section for details and the list of available options.

You can download supported VMware vSphere hypervisor images from the following web page and load it on the M.2 drive using the instructions provided:
https://vmware.lenovo.com/content/custom_iso/

The server contains an integrated service processor which provides advanced control, monitoring, and alerting functions. The service processor is based on the ASPEED AST2500 baseboard management controller (BMC).

The server offers light path diagnostics. If an environmental condition exceeds a threshold or if a system component fails, the ASPEED service processor lights LEDs inside the server to help you diagnose the problem and find the failing part. The SR655 has fault LEDs next to the following components:

• Each memory DIMM
• Each drive bay
• Each system fan
• Each power supply

The front of the server also houses an information pull-out tab (also known as the network access tag). See Figure 2 for the location. A label on the tab shows the network information (MAC address and other data) to remotely access the service processor.

Remote management

Remote server management is provided through industry-standard interfaces:

• Intelligent Platform Management Interface (IPMI) Version 2.0
• Simple Network Management Protocol (SNMP) Version 3 (traps and gets)
• Redfish support to the Redfish Schema 2018.1 (DMTF DSP0266 1.5.0 compliant)
• Web browser - HTML 5-based browser interface (Java and ActiveX not required) using a responsive design (content optimized for the device being used - laptop, tablet, phone) with NLS support

Remote connectivity is provided by a dedicated 1Gb Ethernet management port (see the locations of ports at the rear of the server in the Components and connectors section). Remote management can also be performed via the first port of the installed OCP adapter using the shared management capability of the adapter via NC-SI. NC-SI connectivity is 10/100 Mbps Ethernet.

IPMI via the Ethernet port (IPMI over LAN) is supported, however it is disabled by default. For CTO orders you can specify whether you want to the feature enabled or disabled in the factory, using the feature codes listed in the following table.

A virtual presence (iKVM remote control and virtual media) capability also comes standard in the server for remote server management.

The remote control functions include the following:

• Remotely viewing video with graphics resolutions up to 1920x1080 at 60 Hz and 32 bits per pixel, regardless of the system state
• Remotely accessing the server using the keyboard and mouse from a remote client
• Full remote administration with seamless access from UEFI POST through to operating system load
• OS independent - no drivers or OS agents required
• Support for up to four remote users simultaneously

The remote media functions include:

• USB 2.0 compliant connectivity
• Up to four simultaneously mounted diskette, HDD, CD, DVD, USB flash drive, or image files
• Optional encryption on connections
• Requires Java Runtime Environment (JRE) 1.4.2 or later
• Can be used as a boot device
• Persistent session across system reset (but not across AC power loss)

Lenovo XClarity Energy Manager offers the following capabilities:

• Monitors room, row, rack, and device levels in the data center
• Reports vital server information, such as power, temperature and resource utilization
• Monitors inlet temperature to locate hot spots, reducing the risk of data or device damage
• Provides finely-grained controls to limit platform power in compliance with IT policy
• Generates alerts when a user-defined threshold is reached

Note: In the SR655, system power capping function is not supported on Lenovo XClarity Energy Manager.

Lenovo XClarity Energy Manager is an optional software component that is licensed on a per managed node basis, that is, each managed server requires a license. To manage systems, a node license pack should be purchased. The following table lists the geo-specific Lenovo XClarity Energy Manager software license options.

Lenovo Capacity Planner is a power consumption evaluation tool that enhances data center planning by enabling IT administrators and pre-sales professionals to understand various power characteristics of racks, servers, and other devices. Capacity Planner can dynamically calculate the power consumption, current, British Thermal Unit (BTU), and volt-ampere (VA) rating at the rack level, improving the planning efficiency for large scale deployments.

For more information, refer to the Capacity Planner web page:
http://datacentersupport.lenovo.com/us/en/solutions/lnvo-lcp

The SR655 server offers the following security features:

• Administrator and power-on password
• Integrated Trusted Platform Module (TPM) supporting TPM 2.0
• Optional Nationz TPM 2.0, available only in China (CTO only)
• Optional chassis intrusion switch (CTO only)
• Optional lockable front security bezel

The optional lockable front security bezel is shown in the following figure and includes a key that enables you to secure the bezel over the drives and system controls thereby reducing the chance of unauthorized or accidental access to the server.

Figure 14. Lockable front security bezel

The dimensions of the security bezel are:

• Width: 437 mm (17.2 in.)
• Height: 87 mm (3.4 in.)
• Width: 23 mm (0.9 in.)

The following table lists the security options for the SR655.

* Not available as a field upgrade. The component is CTO or in pre-configured models only.

The following table lists the rack installation options that are available for the server.

The VGA Upgrade Kit allows you to upgrade your server by adding a VGA video port to the front of the server (if the server does not already come with a front VGA port). When the front VGA is in use, the rear VGA port is automatically disabled.

The following table summarizes the rail kit features and specifications.

* For 0U PDU support, the rack must be at least 1100 mm (43.31 in.) deep without a CMA, or at least 1200 mm (47.24 in.) deep if a CMA is used.
** For 0U PDU support with the friction rail kit, the rack must be at least 1000 mm (39.37 in.) deep.
*** Measured when mounted on the rack, from the front surface of the front mounting flange to the rear most point of the rail.

The server supports the following operating systems:

• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Red Hat Enterprise Linux 7.6
• Red Hat Enterprise Linux 8.0
• Red Hat Enterprise Linux 8.1
• SUSE Linux Enterprise Server 12 SP4
• SUSE Linux Enterprise Server 12 SP5
• SUSE Linux Enterprise Server 12 Xen SP4
• SUSE Linux Enterprise Server 12 Xen SP5
• SUSE Linux Enterprise Server 15 SP1
• SUSE Linux Enterprise Server 15 Xen SP1
• VMware ESXi 6.5 U3
• VMware ESXi 6.7 U3

For a complete list of supported, certified and tested operating systems, plus additional details and links to relevant web sites, see the Operating System Interoperability Guide: https://lenovopress.com/osig#servers=sr655-7y00-7z01

For configure-to-order configurations, the server can be preloaded with VMware ESXi installed on M.2 cards. Ordering information is listed in the following table.

Dimensions and weight:

• Height: 86 mm (3.4 in.)
• Width: 445 mm (17.5 in.)
• Depth: 765 mm (30.1 in.)
• Maximum weight: 35.4 kg (78.0 lb)

Electrical specifications:

• Electrical - Input voltage
  • 100 - 127 (nominal) V AC, 50 Hz or 60 Hz
  • 200 - 240 (nominal) V AC, 50 Hz or 60 Hz
  • 180 - 300 V DC (China only)
• Inlet current:
  • 100-127 V:
    • 550W power supply: 6.2 A
    • 750W power supply: 8.4 A
    • 1100W power supply: 12 A
  • 200-240 V:
    • 550W power supply: 3.0 A
    • 750W power supply: 4.1 A
    • 1100W power supply: 6 A
    • 1600W power supply: 8.7 A

The ThinkSystem SR655 server complies with ASHRAE Class A2 specifications, and depending on the hardware configuration, also complies with ASHRAE Class A3 and Class A4 specifications. System performance may be impacted when operating temperature is outside ASHRAE A2 specification.

The restrictions to ASHRAE A2 support are as follows:

• With 24x NVMe front drive bays + 8x mid-chassis drive bays, ambient temperature cannot exceed 30°C
• With 8x 3.5-inch front drives + 6x single-wide GPUs, ambient temperature cannot exceed 30°C
• With 8x 3.5-inch or 8x 2.5-inch front drives + 3x double-wide GPUs, ambient temperature cannot exceed 30°C

See the GPU adapters section for details.

To comply with ASHRAE A3 and A4 specifications, the server models must meet the following hardware configuration requirements:

• Processor TDP greater than 155W not supported; the only exception is a configuration with 24x 2.5-inch front drive bays, where the processor TDP cannot exceed 120W.
• No support for 12x 3.5-inch front drive bays (the 8x 3.5-inch bay configuration is supported)
• No support for NVMe drives
• No support for rear drive bays or mid drive bays
• No support for GPUs
• No support for M.2
• No support for PCIe flash storage adapters
• No support for OCP networking adapters
• No support for Ethernet adapters of 10GbE or higher

The server is supported in the following environment:

• Air temperature:
  • Operating:
    • ASHRAE Class A2: 10°C to 35°C (50°F to 95°F); the maximum ambient temperature decreases by 1°C for every 300 m (984 ft) increase in altitude above 900 m (2,953 ft).
    • ASHRAE Class A3: 5°C to 40°C (41°F to 104°F); the maximum ambient temperature decreases by 1°C for every 175 m (574 ft) increase in altitude above 900 m (2,953 ft).
    • ASHRAE Class A4: 5°C to 45°C (41°F to 113°F); the maximum ambient temperature decreases by 1°C for every 125 m (410 ft) increase in altitude above 900 m (2,953 ft).
  • Server off: 5°C to 45°C (41°F to 113°F)
  • Shipment/storage: -40°C to 60°C (-40°F to 140°F)
• Maximum altitude: 3,050 m (10,000 ft)
• Relative Humidity (non-condensing):
  • Operating
    • ASHRAE Class A2: 8% to 80%; maximum dew point: 21°C (70°F)
    • ASHRAE Class A3: 8% to 85%; maximum dew point: 24°C (75°F)
    • ASHRAE Class A4: 8% to 90%; maximum dew point: 24°C (75°F)
  • Shipment/storage: 8% to 90% 

The server generates the following heat and noise:

• Heat/thermal output:
  • Minimum configuration: 421 BTU/hr, 123 W
  • Maximum configuration: 5606 BTU/hr, 1643 W

• Noise level (LWAm)
  • Sound power, idling: 5.0 bels (minimum), 6.2 bels (typical), 6.5 bels (maximum)
  • Sound power, operating: 5.0 bels (minimum), 6.2 bels (typical), 6.5 bels (maximum)

The server has the following vibration and shock limits:

• Vibration:
  • Operating: 0.21 G rms at 5 Hz to 500 Hz for 15 minutes across 3 axes
  • Non-operating: 1.04 G rms at 2 Hz to 200 Hz for 15 minutes across 6 surfaces
• Shock:
  • Operating: 15 G for 3 milliseconds in each direction (positive and negative X, Y, and Z axes)
  • Non-operating:
    • 23 kg - 31 kg: 35 G for 152 in./sec velocity change across 6 surfaces (3x GPU config, 2.5” config)
    • 32 kg - 68 kg: 35 G for 136 in./sec velocity change across 6 surfaces (20x 3.5” HDD config)

Weight information for SR655 measuring in shock & vibration test:

• 3.5"x 12 HS + 3x DW GPU: 31.74 (kg)
• 3.5"x 12 HS + Mid 3.5"x4 HS + Rear 3.5"x4 HS: 35.74 (kg)
• 2.5"x 24 HS + Mid 2.5"x8 HS + Rear 2.5"x4 HS: 29.49 (kg)

The SR655 has a 1-year or 3-year warranty based on the machine type of the system:

• 7Y00: 1 year warranty
• 7Z01: 3 year warranty

The standard warranty terms are customer-replaceable unit (CRU) and onsite (for field-replaceable units FRUs only) with standard call center support during normal business hours and 9x5 Next Business Day Parts Delivered.

Lenovo’s additional support services provide a sophisticated, unified support structure for your data center, with an experience consistently ranked number one in customer satisfaction worldwide. Available offerings include:

• Premier Support

  Premier Support provides a Lenovo-owned customer experience and delivers direct access to technicians skilled in hardware, software, and advanced troubleshooting, in addition to the following:

  • Direct technician-to-technician access through a dedicated phone line
  • 24x7x365 remote support
  • Single point of contact service
  • End to end case management
  • Third-party collaborative software support
  • Online case tools and live chat support
  • On-demand remote system analysis
• Warranty Upgrade (Preconfigured Support)

  Services are available to meet the on-site response time targets that match the criticality of your systems.

  • 3, 4, or 5 years of service coverage
  • 1-year or 2-year post-warranty extensions
  • Foundation Service: 9x5 service coverage with next business day onsite response. YourDrive YourData is an optional extra (see below).
  • Essential Service: 24x7 service coverage with 4-hour onsite response or 24-hour committed repair (available only in select countries). Bundled with YourDrive YourData.
  • Advanced Service: 24x7 service coverage with 2-hour onsite response or 6-hour committed repair (available only in select countries). Bundled with YourDrive YourData.
• Managed Services

  Lenovo Managed Services provides continuous 24x7 remote monitoring (plus 24x7 call center availability) and proactive management of a your data center using state of the art tools, systems, and practices by a team of highly skilled and experienced Lenovo services professionals.

  Quarterly reviews check error logs, verify firmware & OS device driver levels, and software as needed. We’ll also maintain records of latest patches, critical updates, and firmware levels, to ensure you systems are providing business value through optimized performance.

• Technical Account Management (TAM)

  A Lenovo Technical Account Manager helps you optimize the operation of your data center based on a deep understanding of your business. You gain direct access to your Lenovo TAM, who serves as your single point of contact to expedite service requests, provide status updates, and furnish reports to track incidents over time. In addition, your TAM will help proactively make service recommendations and manage your service relationship with Lenovo to make certain your needs are met.

• Enterprise Server Software Support

  Enterprise Software Support is an additional support service providing customers with software support on Microsoft, Red Hat, SUSE, and VMware applications and systems. Around the clock availability for critical problems plus unlimited calls and incidents helps customers address challenges fast, without incremental costs. Support staff can answer troubleshooting and diagnostic questions, address product comparability and interoperability issues, isolate causes of problems, report defects to software vendors, and more.

• YourDrive YourData

  Lenovo’s YourDrive YourData is a multi-drive retention offering that ensures your data is always under your control, regardless of the number of drives that are installed in your Lenovo server. In the unlikely event of a drive failure, you retain possession of your drive while Lenovo replaces the failed drive part. Your data stays safely on your premises, in your hands. The YourDrive YourData service can be purchased in convenient bundles, and is optional with Foundation Service. It is bundled with Essential Service and Advanced Service.

• Health Check

  Having a trusted partner who can perform regular and detailed health checks is central to maintaining efficiency and ensuring that your systems and business are always running at their best. Health Check supports Lenovo-branded server, storage, and networking devices, as well as select Lenovo-supported products from other vendors that are sold by Lenovo or a Lenovo-Authorized Reseller.

Examples of region-specific warranty terms are second or longer business day parts delivery or parts-only base warranty.

If warranty terms and conditions include onsite labor for repair or replacement of parts, Lenovo will dispatch a service technician to the customer site to perform the replacement. Onsite labor under base warranty is limited to labor for replacement of parts that have been determined to be field-replaceable units (FRUs). Parts that are determined to be customer-replaceable units (CRUs) do not include onsite labor under base warranty.

If warranty terms include parts-only base warranty, Lenovo is responsible for delivering only replacement parts that are under base warranty (including FRUs) that will be sent to a requested location for self-service. Parts-only service does not include a service technician being dispatched onsite. Parts must be changed at customer’s own cost and labor and defective parts must be returned following the instructions supplied with the spares parts.

Lenovo Services is a dedicated partner to your success. Our goal is to reduce your capital outlays, mitigate your IT risks, and accelerate your time to productivity.

Here’s a more in-depth look at what we can do for you:

• Asset Recovery Services

  Asset Recovery Services (ARS) helps customers recover the maximum value from their end-of-life equipment in a cost-effective and secure way. On top of simplifying the transition from old to new equipment, ARS mitigates environmental and data security risks associated with data center equipment disposal. Lenovo ARS is a cash-back solution for equipment based on its remaining market value, yielding maximum value from aging assets and lowering total cost of ownership for your customers. For more information, see the ARS page, https://lenovopress.com/lp1266-reduce-e-waste-and-grow-your-bottom-line-with-lenovo-ars.

• Assessment Services

  An Assessment helps solve your IT challenges through an onsite, multi-day session with a Lenovo technology expert. We perform a tools based assessment which provides a comprehensive and thorough review of a company's environment and technology systems. In addition to the technology based functional requirements, the consultant also discusses and records the non-functional business requirements, challenges, and constraints. Assessments help organizations like yours, no matter how large or small, get a better return on your IT investment and overcome challenges in the ever-changing technology landscape.

• Design Services

  Professional Services consultants perform infrastructure design and implementation planning to support your strategy. The high-level architectures provided by the assessment service are turned into low level designs and wiring diagrams, which are reviewed and approved prior to implementation The implementation plan will demonstrate an outcome-based proposal to provide business capabilities through infrastructure with a risk-mitigated project plan.

• Basic Hardware Installation

  Lenovo experts can seamlessly manage the physical installation of your server, storage, or networking hardware. Working at a time convenient for you (business hours or off shift), the technician will unpack and inspect the systems on your site, install options, mount in a rack cabinet, connect to power and network, check and update firmware to the latest levels, verify operation, and dispose of the packaging, allowing your team to focus on other priorities.

• Deployment Services

  When investing in new IT infrastructures, you need to ensure your business will see quick time to value with little to no disruption. Lenovo deployments are designed by development and engineering teams who know our Products & Solutions better than anyone else, and our technicians own the process from delivery to completion. Lenovo will conduct remote preparation and planning, configure & integrate systems, validate systems, verify and update appliance firmware, train on administrative tasks, and provide post-deployment documentation. Customer’s IT teams leverage our skills to enable IT staff to transform with higher level roles and tasks.

• Integration, Migration, and Expansion Services

  Move existing physical & virtual workloads easily, or determine technical requirements to support increased workloads while maximizing performance. Includes tuning, validation, and documenting ongoing run processes. Leverage migration assessment planning documents to perform necessary migrations.

Some service options may not be available in all countries. For more information, go to https://www.lenovo.com/systems/services. For information about Lenovo service upgrade offerings that are available in your region, contact your local Lenovo sales representative or business partner.

The SR655 server conforms to the following standards:

• Energy Star 3.0
• FCC: Verified to comply with Part 15 of the FCC Rules, Class A
• Canada ICES-003, issue 6, Class A
• UL/IEC 60950-1
• CSA C22.2 No. 60950-1
• NOM-019
• Argentina IEC60950-1
• Japan VCCI, Class A
• Australia/New Zealand AS/NZS CISPR 32, Class A; AS/NZS 60950.1
• IEC 60950-1 (CB Certificate and CB Test Report)
• China CCC (GB4943.1), GB9254 Class A, GB17625.1
• Taiwan BSMI CNS13438, Class A; CNS14336-1
• Korea KN32, Class A; KN35
• Russia, Belorussia and Kazakhstan, EAC: TP TC 004/2011(for Safety); TP TC 020/2011(for EMC)
• CE Mark (EN55032 Class A, EN60950-1, EN55024, EN61000-3-2, and EN61000-3-3)
• CISPR 32, Class A
• TUV-GS (EN60950-1 /IEC60950-1, EK1-ITB2000)
• India BIS certification

The server supports attachment to external drive enclosures using a RAID controller with external ports or a SAS host bus adapter. Adapters supported by the server are listed in the SAS adapters for external storage section.

Note: Information provided in this section is for ordering reference purposes only. For the operating system and adapter support details, refer to the interoperability matrix for a particular storage enclosure that can be found on the Lenovo Data Center Support web site:
http://datacentersupport.lenovo.com

For details about supported drives, adapters, and cables, see the following Lenovo Press Product Guides:

• Lenovo Storage D1212 and D1224
  http://lenovopress.com/lp0512
• Lenovo Storage D3284
  http://lenovopress.com/lp0513

The following table lists the external storage systems that are currently offered by Lenovo.

Note: Information provided in this section is for ordering reference purposes only. End-to-end storage configuration support must be verified through the interoperability matrix for a particular storage system that can be found on the Lenovo Data Center Support web site:
http://datacentersupport.lenovo.com

* Preconfigured models that are available only in North America (part numbers that have NA at the end) or EMEA (part numbers that have EA at the end) and require Preconfigured support to be purchased with the storage system (See the respective product guide for details).

For more information, see the list of Product Guides in the Lenovo Storage category:
http://lenovopress.com/storage/san/lenovo#rt=product-guide

The server supports both USB-attached RDX backup units and SAS-attached tape drives.

The following table lists the available external SAS tape backup options.

Tip: Verify the end-to-end support of an IBM tape backup solution through the IBM System Storage Interoperation Center (SSIC): http://www.ibm.com/systems/support/storage/ssic

For more information, see the list of Product Guides in the Backup units category:
https://lenovopress.com/servers/options/backup

The following table lists the external RDX backup options available.

For more information, see the Lenovo RDX USB 3.0 Disk Backup Solution product guide:
https://lenovopress.com/tips0894-rdx-usb-30

The following table lists the Fibre Channel SAN switches that are offered by Lenovo and can be used with this system.

For more information, see the list of Product Guides in the Rack SAN Switches category:
http://lenovopress.com/storage/switches/rack#rt=product-guide

The following table lists the uninterruptible power supply (UPS) units that are offered by Lenovo.

† Only available in China and countries in the Asia Pacific region.

For more information, see the list of Product Guides in the UPS category:
https://lenovopress.com/servers/options/ups

The following table lists the power distribution units (PDUs) that are offered by Lenovo.

* Not available in USA and Canada

For more information, see the Lenovo Press documents in the PDU category:
https://lenovopress.com/servers/options/pdu

The following table lists the supported rack cabinets.

* Withdrawn from marketing

For specifications about these racks, see the Lenovo Rack Cabinet Reference, available from:
https://lenovopress.com/lp1287-lenovo-rack-cabinet-reference

For more information, see the list of Product Guides in the Rack cabinets category:
https://lenovopress.com/servers/options/racks

The following table lists the supported KVM consoles, keyboards, and KVM switches.

For more information, see the list of Product Guides in the KVM Switches and Consoles category:
http://lenovopress.com/servers/options/kvm

Lenovo Financial Services reinforces Lenovo’s commitment to deliver pioneering products and services that are recognized for their quality, excellence, and trustworthiness. Lenovo Financial Services offers financing solutions and services that complement your technology solution anywhere in the world.

We are dedicated to delivering a positive finance experience for customers like you who want to maximize your purchase power by obtaining the technology you need today, protect against technology obsolescence, and preserve your capital for other uses.

We work with businesses, non-profit organizations, governments and educational institutions to finance their entire technology solution. We focus on making it easy to do business with us. Our highly experienced team of finance professionals operates in a work culture that emphasizes the importance of providing outstanding customer service. Our systems, processes and flexible policies support our goal of providing customers with a positive experience.

We finance your entire solution. Unlike others, we allow you to bundle everything you need from hardware and software to service contracts, installation costs, training fees, and sales tax. If you decide weeks or months later to add to your solution, we can consolidate everything into a single invoice.

Our Premier Client services provide large accounts with special handling services to ensure these complex transactions are serviced properly. As a premier client, you have a dedicated finance specialist who manages your account through its life, from first invoice through asset return or purchase. This specialist develops an in-depth understanding of your invoice and payment requirements. For you, this dedication provides a high-quality, easy, and positive financing experience.

For your region specific offers please ask your Lenovo sales representative or your technology provider about the use of Lenovo Financial Services. For more information, see the following Lenovo website:

https://www.lenovo.com/us/en/landingpage/lenovo-financial-services/

For more information, see these resources:

• Lenovo ThinkSystem SR655 product page:
  https://www.lenovo.com/us/en/data-center/servers/racks/ThinkSystem-SR655-Server/p/77XX7SRSR75
• Interactive 3D Tour of the ThinkSystem SR655:
  https://lenovopress.com/lp1183
• Lenovo Press video walk-through of the ThinkSystem SR655:
  https://lenovopress.com/lp1185
• ThinkSystem SR655 drivers and support
  http://datacentersupport.lenovo.com/products/servers/thinksystem/sr655/7z01/downloads
• Lenovo Hardware Installation & Removal Videos on the SR655:
  • YouTube: https://www.youtube.com/playlist?list=PLYV5R7hVcs-BYjgwMTzXbgbC6fhKRsCdR
  • Youku: http://list.youku.com/albumlist/show/id_52222445.html
• Lenovo ThinkSystem SR655 product publications:
  http://thinksystem.lenovofiles.com/help/index.jsp
  • Quick Start
  • Rack Installation Guide
  • Setup Guide
  • Hardware Maintenance Manual
  • Messages and Codes Reference
  • Memory Population Reference
• ServerProven hardware compatibility:
  http://www.lenovo.com/us/en/serverproven