B-17

User

Guide

for

the

Cisco

Application

Networking

Manager

5.2

OL-26572-01

Appendix

B

Using

the

ANM

Plug-In

With

Virtual

Data

Centers

Managing

ACE

Real

Servers

From

vSphere

Client

Step

3

In

the

ACE

Reals

table,

check

the

check

box

of

the

servers

that

you

want

to

suspend

and

click

Suspend.

The

Suspend

Real

Servers

window

appears.

Step

4

In

the

Reason

field

of

the

Suspend

Real

Servers

window,

enter

the

reason

for

this

action.

You

mi

ght

enter

a

trouble

ticket,

an

order

ticket,

or

a

user

message.

Note

Do

not

enter

a

password

in

this

field.

Step

5

From

the

Suspend

Real

Servers

Type

drop-down

list,

choose

one

of

the

following:

•

Graceful—When

executed

on

a

primary

server,

the

ACE

gracefully

shuts

down

the

server

with

sticky

connections

as

fo

llows:

–

Tears

down

existing

non-TCP

connections

to

the

server

–

Allows

current

TCP

connections

to

complete

–

Allows

new

sticky

connections

for

existing

server

connections

that

match

entries

in

the

sticky

database

–

Load

balances

all

new

connections

(other

than

the

matching

sticky

connections

mentioned

above)

to

the

other

servers

in

the

server

farm

When

executed

on

a

backup

real

server,

the

ACE

places

the

backup

server

in

service

standby

mode.

Note

For

the

CSS,

when

the

device

is

in

the

In

Service

admin

state

and

you

perform

a

graceful

suspend

operation,

ANM

saves

the

last

known

non-zero

service

(or

real

server)

weight,

and

then

sets

the

weight

to

zero.

ANM

references

the

saved

weight

when

performing

an

Activate

operation.

If

the

current

weight

is

zero,

and

a

non-zero

weight

has

been

saved

for

that

service

(or

real

server),

the

Activate

operation

also

sets

the

weight

to

the

saved

value.

To

al

low

ANM

to

save

and

reset

t

he

weight

value

when

gr

acefully

suspending

and

then

activating

the

CSS,

you

must

have

the

device

configured

to

permit

SNMP

traffic.

For

each

device

type,

see

the

corresponding

configuration

guide

to

configure

the

device

to

permit

SNMP

traffic.

When

the

CSS

is

in

the

In

Service

Standby

admin

state

and

you

perform

a

graceful

suspend

operation,

ANM

does

not

set

the

weight

to

zero.

•

Suspend—The

ACE

resets

all

non-TCP

connections

to

the

server.

For

TCP

connections,

existing

flows

are

allowed

to

complete

before

the

ACE

takes

the

real

server

out

of

service.

No

new

connections

are

allowed.

The

ACE

resets

all

Secure

Sockets

Layer

(SSL)

connections

to

the

real

server.

•

Suspend

and

Clear

Connections—The

ACE

performs

the

tasks

described

for

Suspend

and

clears

the

existing

connections

to

this

server.