1.安装device-mapper-multipath，在安装操作系统时需要选择此多路径软件，如果没有安装，请用linux系统安装光盘安装，应该是开头为device-mapper-mutipath的rpm包。
2.运行如下命令：
#mpathconf --enable --with_multipathd y 创建配置文件，启动守护进程。
#multipath -ll 查看聚合完成的多路径设备
3.如何想要两个节点的磁盘的名称一致，需要修改/etc/multipath/bindings文件，将wwid一致的磁盘名称（即mpathb类似的名称）改成一致，然后执行：
#service multipathd stop
#multipath -F
#multipath -v2
#service multipathd restart
4. #multipath -ll 查看聚合完成的多路径设备
查看两边磁盘名称是否一致即wwid是否一一对应。然后重启主机，确保多路径设备还在。使用磁盘需使用/dev/mapper/mpathb类似于这个路径的磁盘使用使用dm-1之类的磁盘
=============================================================
db01
mpatha 3600605b008b1fdb01b0110c21941eb6b
mpathb 360050763008182150000000000000000
mpathc 360050763008182150000000000000001
mpathd 360050763008182150000000000000002
mpathe 360050763008182150000000000000003
mpathf 360050763008182150000000000000004
mpathg 360050763008182150000000000000005
mpathh 360050763008182150000000000000006
db02
mpatha 3600605b008b1fdb01b0110c21941eb6b
mpathb 360050763008182150000000000000000
mpathc 360050763008182150000000000000001
mpathd 360050763008182150000000000000002
mpathe 360050763008182150000000000000003
mpathf 360050763008182150000000000000004
mpathg 360050763008182150000000000000005
mpathh 360050763008182150000000000000006
=================================
mpatha 3600605b008b1fdb01b0110c21941eb6b
mpathb 360050763008182150000000000000000
mpathc 360050763008182150000000000000002
mpathd 360050763008182150000000000000006
mpathe 360050763008182150000000000000005
mpathf 360050763008182150000000000000004
mpathg 360050763008182150000000000000003
mpathh 360050763008182150000000000000001
[root@db01 multipath]# multipath -ll
mpathe (360050763008182150000000000000005) dm-3 IBM,2145
size=30G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:5 sdg 8:96 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:5 sdn 8:208 active ready running
mpathd (360050763008182150000000000000006) dm-2 IBM,2145
size=900G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:6 sdo 8:224 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:6 sdh 8:112 active ready running
mpathc (360050763008182150000000000000002) dm-1 IBM,2145
size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:2 sdk 8:160 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:2 sdd 8:48 active ready running
mpathb (360050763008182150000000000000000) dm-0 IBM,2145
size=5.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:0 sdi 8:128 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:0 sdb 8:16 active ready running
mpathh (360050763008182150000000000000001) dm-6 IBM,2145
size=5.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:1 sdc 8:32 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:1 sdj 8:144 active ready running
mpathg (360050763008182150000000000000003) dm-5 IBM,2145
size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:3 sde 8:64 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:3 sdl 8:176 active ready running
mpathf (360050763008182150000000000000004) dm-4 IBM,2145
size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:4 sdm 8:192 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:4 sdf 8:80 active ready running
[root@db01 multipath]#
mpatha 3600605b008b268f01b00ffb61499ea2d
mpathb 360050763008182150000000000000001
mpathc 360050763008182150000000000000000
mpathd 360050763008182150000000000000002
mpathe 360050763008182150000000000000005
mpathf 360050763008182150000000000000003
mpathg 360050763008182150000000000000006
mpathh 360050763008182150000000000000004
[root@db02 multipath]# multipath -ll
mpathe (360050763008182150000000000000005) dm-3 IBM,2145
size=30G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:5 sdg 8:96 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:5 sdn 8:208 active ready running
mpathd (360050763008182150000000000000002) dm-2 IBM,2145
size=500G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:2 sdk 8:160 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:2 sdd 8:48 active ready running
mpathc (360050763008182150000000000000000) dm-1 IBM,2145
size=5.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:0 sdi 8:128 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:0 sdb 8:16 active ready running
mpathb (360050763008182150000000000000001) dm-0 IBM,2145
size=5.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:1 sdc 8:32 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:1 sdj 8:144 active ready running
mpathh (360050763008182150000000000000004) dm-6
IBM,2145
size=500G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:4 sdm 8:192 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:4 sdf 8:80 active ready running
mpathg (360050763008182150000000000000006) dm-5 IBM,2145
size=900G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 4:0:0:6 sdo 8:224 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 3:0:0:6 sdh 8:112 active ready running
mpathf (360050763008182150000000000000003) dm-4 IBM,2145
size=500G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:3 sde 8:64 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:3 sdl 8:176 active ready running
[root@db02 multipath]#