另外，在配置

RHCS5.3

時，

Fence

設備只

ping

通還不行，還必須經過測試，我在網上找了一

篇

IPMI

的文章，現粘貼如下：

What?is?IPMI?

Intelligent?Platform?Management?Interface

[edit]

Advantages

Low?cost.

Available?on?most?recent?server?systems.

[edit]

Disadvantages

There?is?no?way?to?retain?power?to?the?IPMI?BMC?if?power?to?the?host?is?lost.?If?power?is?lost?to

the

host,

fencing

will

fail.

This

will

delay

cluster

recovery.

It

is

recommended

to

either

have

a

second

fencing

device

(external

power

switch)

or

a

server

with

multiple

power

supplies

when

using?IPMI?over?LAN?for?fencing.

Some?IPMI?implementations?share?an?ethernet?interface?with?the?host?operating?system.?If?this

interface?is?the?same?one?used?for?the?cluster?communication,?a?loss?of?connectivity?to?this?port

will

cause

a

need

for

fencing

but

also

cause

fencing

to

fail,

delaying

cluster

recovery.

It

is

recommended

that

the

ethernet

interface

the

BMC

uses

be

reserved

exclusively

for

BMC

use;

that?is,?the?host?operating?system?should?not?use?the?BMC's?NIC.

[edit]

Prerequisites

You?will?need?the?OpenIPMI?packages?and?the?ipmitool?utility?in?order?to?use?this?mini-howto.?On

Red?Hat?Enterprise?Linux?5?and?CentOS?5,?the?packages?you?need?are:

OpenIPMI

OpenIPMI-tools

You?will?also?need?some?free?IP?addresses?which?you?assign?to?IPMI?devices.

This?mini-HOWTO?is?for?machines?which?have?not?had?IPMI-over-LAN?set?up?before.

[edit]

Basic?Configuration

See?if?you?can?start?ipmi:

[root@et-virt05?~]#?service?ipmi?start

Starting?ipmi?drivers:

[??OK??]

If?it?fails?(FAILED),?go?have?a?beer?or?something,?because?the?rest?of?this?howto?will?not?help?you.

If?it?succeeds,?you?should?see?something?like?this?(may?differ?by?hardware)?in?dmesg?output:

ipmi?message?handler?version?39.1

IPMI?System?Interface?driver.

ipmi_si:?Trying?SMBIOS-specified?kcs?state?machine?at?i/o?address?0xca8,?slave?address?0x20,?irq?0

ipmi:?Found?new?BMC?(man_id:?0x0002a2,??prod_id:?0x0000,?dev_id:?0x20)

IPMI?kcs?interface?initialized

ipmi?device?interface

Ok!?Moving,?on...

總結

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