1、安装多路径软件包：

[root@flash Packages]# ls device-mapper*

device-mapper-1.02.77-9.el6.x86_64.rpm             device-mapper-libs-1.02.77-9.el6.x86_64.rpm

device-mapper-event-1.02.77-9.el6.x86_64.rpm       device-mapper-multipath-0.4.9-64.el6.x86_64.rpm

device-mapper-event-libs-1.02.77-9.el6.i686.rpm    device-mapper-multipath-libs-0.4.9-64.el6.i686.rpm

device-mapper-event-libs-1.02.77-9.el6.x86_64.rpm  device-mapper-multipath-libs-0.4.9-64.el6.x86_64.rpm

device-mapper-libs-1.02.77-9.el6.i686.rpm          device-mapper-persistent-data-0.1.4-1.el6.x86_64.rpm

[root@flash Packages]# rpm -ivh device-mapper-1.02.77-9.el6.x86_64.rpm

warning: device-mapper-1.02.77-9.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY

Preparing...                ########################################### [100%]

package device-mapper-1.02.77-9.el6.x86_64 is already installed

[root@flash Packages]# rpm -ivh device-mapper-event-1.02.77-9.el6.x86_64.rpm

warning: device-mapper-event-1.02.77-9.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY

Preparing...                ########################################### [100%]

package device-mapper-event-1.02.77-9.el6.x86_64 is already installed

[root@flash Packages]# rpm -ivh device-mapper-multipath-0.4.9-64.el6.x86_64.rpm

warning: device-mapper-multipath-0.4.9-64.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY

error: Failed dependencies:

device-mapper-multipath-libs = 0.4.9-64.el6 is needed by device-mapper-multipath-0.4.9-64.el6.x86_64

libmpathpersist.so.0()(64bit) is needed by device-mapper-multipath-0.4.9-64.el6.x86_64

libmultipath.so()(64bit) is needed by device-mapper-multipath-0.4.9-64.el6.x86_64

[root@flash Packages]# rpm -ivh device-mapper-multipath-libs-0.4.9-64.el6.x86_64.rpm

warning: device-mapper-multipath-libs-0.4.9-64.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY

Preparing...                ########################################### [100%]

1:device-mapper-multipath########################################### [100%]

[root@flash Packages]# rpm -ivh device-mapper-multipath-0.4.9-64.el6.x86_64.rpm

warning: device-mapper-multipath-0.4.9-64.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY

Preparing...                ########################################### [100%]

1:device-mapper-multipath########################################### [100%]

[root@flash Packages]#

2、设置开机启动，并检查安装包是否正常：

[root@flash Packages]# /etc/init.d/multipathd start

Starting multipathd daemon: [  OK  ]

[root@flash Packages]# chkconfig multipathd on

[root@flash Packages]# chkconfig --level 345 multipathd on

[root@flash Packages]# chkconfig --list multipathd

multipathd      0:off   1:off   2:on    3:on    4:on    5:on    6:off

[root@flash Packages]# multipath -ll

Nov 30 20:38:45 | /etc/multipath.conf does not exist, blacklisting all devices.

Nov 30 20:38:45 | A sample multipath.conf file is located at

Nov 30 20:38:45 | /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf

Nov 30 20:38:45 | You can run /sbin/mpathconf to create or modify /etc/multipath.conf

[root@flash Packages]# /sbin/mpathconf

multipath is enabled

find_multipaths is disabled

user_friendly_names is enabled

dm_multipath module is loaded

multipathd is chkconfiged on

[root@flash Packages]# multipath -ll

Nov 30 20:39:13 | /etc/multipath.conf does not exist, blacklisting all devices.

Nov 30 20:39:13 | A sample multipath.conf file is located at

Nov 30 20:39:13 | /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf

Nov 30 20:39:13 | You can run /sbin/mpathconf to create or modify /etc/multipath.conf

[root@flash Packages]# cp  /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf

[root@flash Packages]# multipath -ll

[root@flash Packages]# multipath -v2

[root@RKDB01 Server]# modprobe dm-multipath

[root@RKDB01 Server]# multipath -F

[root@RKDB01 Server]# multipath dm-multipath

[root@RKDB01 Server]# multipath dm-round-robin

[root@RKDB01 Server]# service multipathd restart

[root@flash ~]# cd /etc/multipath

[root@flash multipath]# ll

total 8

-rw-------. 1 root root 364 Nov 30 23:38 bindings

-rw-------. 1 root root 298 Nov 30 23:38 wwids

[root@flash multipath]# cat bindings

# Multipath bindings, Version : 1.0

# NOTE: this file is automatically maintained by the multipath program.

# You should not need to edit this file in normal circumstances.

#

# Format:

# alias wwid

#

mpatha 3600507605810dab81c07600e2c19b4d1

mpathb 3600507680c80804ab800000000000075

mpathc 3600507680c80804ab800000000000074

mpathd 3600507680c80804ab800000000000073

[root@flash multipath]# cat wwids

# Multipath wwids, Version : 1.0

# NOTE: This file is automatically maintained by multipath and multipathd.

# You should not need to edit this file in normal circumstances.

#

# Valid WWIDs:

/3600507680c80804ab800000000000075/

/3600507680c80804ab800000000000074/

/3600507680c80804ab800000000000073/

[root@flash multipath]# multipath -ll

Dec 01 00:10:52 | sdh: couln't get asymmetric access state

Dec 01 00:10:52 | sde: couln't get asymmetric access state

mpathd (3600507680c80804ab800000000000073) dm-2 IBM,2145

size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw

|-+- policy='round-robin 0' prio=24 status=active

| |- 1:0:0:0 sdb 8:16  active ready running

| `- 0:0:0:0 sdh 8:112 active ready running

`-+- policy='round-robin 0' prio=4 status=enabled

|- 1:0:1:0 sde 8:64  active ready running

`- 0:0:1:0 sdk 8:160 active ready running

mpathc (3600507680c80804ab800000000000074) dm-1 IBM,2145

size=2.0T features='1 queue_if_no_path' hwhandler='0' wp=rw

|-+- policy='round-robin 0' prio=50 status=active

| `- 1:0:1:1 sdf 8:80  active ready running

`-+- policy='round-robin 0' prio=10 status=enabled

`- 1:0:0:1 sdc 8:32  active ready running

mpathb (3600507680c80804ab800000000000075) dm-0 IBM,2145

size=2.0T features='1 queue_if_no_path' hwhandler='0' wp=rw

|-+- policy='round-robin 0' prio=50 status=active

| |- 1:0:0:2 sdd 8:48  active ready running

| `- 0:0:0:2 sdj 8:144 active ready running

`-+- policy='round-robin 0' prio=10 status=enabled

|- 1:0:1:2 sdg 8:96  active ready running

`- 0:0:1:2 sdm 8:192 active ready running

[root@flash multipath]#

[root@flash multipath]# ll /dev/mapper/

total 0

crw-rw----. 1 root root 10, 236 Nov 30 23:18 control

lrwxrwxrwx. 1 root root       7 Nov 30 23:38 mpathb -> ../dm-0

lrwxrwxrwx. 1 root root       7 Nov 30 23:38 mpathc -> ../dm-1

lrwxrwxrwx. 1 root root       7 Dec  1 00:16 mpathd -> ../dm-2

lrwxrwxrwx. 1 root root       7 Dec  1 00:16 mpathdp1 -> ../dm-3

[root@flash multipath]#