8-26
User
Guide

for

the

Cisco

Application

Networking

Manager

5.2
OL-26572-01
Chapter
8






Configuring

Real

Servers

and

Server

Farms
Configuring
Dynamic

Workload

Scaling
Configuring
Dynamic

Workload

Scaling
Note
Dynamic
Workload

Scaling

requires

ACE

software

Version

A4(2.0)

or

later

release

on

either

device
type
(appliance
or


module).
This
section

describes

how

to

configure

the

ACE

Dynamic

Workload

Scaling

(DWS)

feature,

which
enables
an

ACE

to

burst

traffic

to

a

remote

pool

of

VMs

when

the

average

CPU

and/or

memory

usage
of
the

local

VMs

has

reached

a

specified

maximum

threshold

value.

When

the

usage

drops

below

a
specified
minimum

threshold

value,

the

ACE

stops

bursting

traffic

to

the

remote

VMs.
Note
To
enable

the

ACE

to

use

the
VMs
associated

with

DWS

for

load

balancing,
you
must

configure

them
as
real

servers

on

the

ACE

(see

the

“Configuring

Real

Servers”

section

on

pa

ge

8-5 ).
For
more

information

about

DWS,

see

the

“ANM

Overview”

section

on

page

1-1

and

the

“Dynamic
Workload
Scaling

Overview”

section

on

pa

ge

8-4 .
Prerequisites
DWS
requires

the

following

configuration

elements:

•
An
ACE

with

software

Version
A4(2.0)
or

later

and

configured

with

the
following
items:

–

Nexus

7000

Series

switch—XML

interface

IP

ad

dress

of

t

he

local

Cisco

Nexus

7000

Ser

ies
switch
that

the

ACE

polls

to

obtain

VM

location

information

(local

or

remote).

You

can

define
up
t

o

two

switch

profiles

per

Admin

context

depending

on

the

ACE

software

version

(see
Guidelines
an

d

Restrictions ).

For

i

nformation

about

defining

a

switch

profile,

see

the
“Configuring
and

Verifying

a

Cisco

Nexus

7000

Series

Switch

Connection”

section

on
page
8-27 .
Note
The
Nexus

7000

Series
switch

must

be

configured

for

DCI/OTV

in

the

local

data

center
and
in

the

remote

data

center.

For

details

about

configuring

a

Nexus

7000

for

DCI/OTV,
see
th

e

Cisco

Nexus

7000

NX-OS

OTV

Configuration

Guide,

Release

5.x.

–

VM

Controller—IP

address

of

the

VM

Controller

(also

known

as

VMware

vCenter

Server)

that
the
ACE

sends

a

health

probe

to

monitor

usage

of

the

local

VMs

associated

with

a

server

farm.

–

VM

probe—Probe

that

the

ACE

sends

to

the

VM

Controller

to

monitor

local

VM

usage

based
on
CPU

usage,

memory

usage,

or

both

(see

the

“Configuring

Health

Monitoring”

section

on
page
8-49 ).

–

Server

Farms—Groups

of

networked

real

servers

(physical

servers

and

VMs)

that

provide
content
delivery

(see

the

“Configuring

Server

Farms”

section

on

page

8-30 ).V

•
VMware
vCenter
Server
4.

0

or

l

ater.

•
Multiple
local

and

remote

VMs
configured
as

real

servers

and
associated
with

server

farms
configured
on

the

ACE.

•
ACE
backend

interface

MTU

set
to
1430

or

less

to

accommodate

DCI

encapsulation
and
the
Don’t
Fragment
(DF)

bit

is

automatically

set

on

the

DCI

link.

For

details

about

setting

the

ACE

MTU,

see
the
Cisco

4700

Series

Application

Control

Engine

Appliance

Routing

and

Bridging

Configuration
Guide.