1、安装多路径软件包：
device-mapper-1.02.67-2.el5
device-mapper-event-1.02.67.2.el5
device-mapper-multipath-0.4.7-48.el5
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[root@RKDB01 Server]# rpm -ivh device-mapper-1.02.67-2.el5.x86_64.rpm
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warning: device-mapper-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
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Preparing... ########################################### [100%]
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package device-mapper-1.02.67-2.el5.x86_64 is already installed
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[root@RKDB01 Server]# rpm -ivh device-mapper-event-1.02.67-2.el5.x86_64.rpm
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warning: device-mapper-event-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
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Preparing... ########################################### [100%]
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package device-mapper-event-1.02.67-2.el5.x86_64 is already installed
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[root@RKDB01 Server]# rpm -ivh device-mapper-multipath-0.4.7-48.el5.x86_64.rpm
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warning: device-mapper-multipath-0.4.7-48.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
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Preparing... ########################################### [100%]
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package device-mapper-multipath-0.4.7-48.el5.x86_64 is already installed
2、设置开机启动，并检查安装包是否正常：
chkconfig --level 345 multipathd on
lsmod |grep dm_multipath
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[root@RKDB01 Server]# chkconfig --level 345 multipathd on
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[root@RKDB01 Server]# lsmod |grep dm_multipath
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dm_multipath 58969 0
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scsi_dh 42561 1 dm_multipath
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dm_mod 102417 4 dm_mirror,dm_multipath,dm_raid45,dm_log
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[root@RKDB01 Server]#
3、配置multipathd 使其正常工作，编辑/etc/multipath.conf，开放如下内容：
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defaults {
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udev_dir /dev
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polling_interval 10
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selector "round-robin 0"
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path_grouping_policy multibus
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getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
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prio_callout none
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path_checker readsector0
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rr_min_io 100
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max_fds 8192
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rr_weight priorities
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failback immediate
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no_path_retry fail
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user_friendly_names yes
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}
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blacklist {
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wwid 26353900f02796769
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devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
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devnode "^hd[a-z]"
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}
4、并关闭如下内容
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#blacklist {
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# devnode "*"
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#}
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#defaults {
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27 # user_friendly_names yes
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28 #}
5、完成之后执行如下命令发现多路径：
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[root@RKDB01 Server]# modprobe dm-multipath
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[root@RKDB01 Server]# multipath -F
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[root@RKDB01 Server]# multipath dm-multipath
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[root@RKDB01 Server]# multipath dm-round-robin
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[root@RKDB01 Server]# service multipathd restart
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正在关闭multipathd 端口监控程序： [确定]
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正在启动守护进程multipathd： [确定]
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[root@RKDB01 Server]# multipath -v2
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[root@RKDB01 Server]# multipath -v2
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[root@RKDB01 Server]# multipath -ll
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mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510
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[size=3.3T][features=0][hwhandler=0][rw]
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\_ round-robin 0 [prio=2][ena bled]
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\_ 1:0:0:0 sdb 8:16 [failed][ready]
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\_ 1:0:1:0 sdc 8:32 [failed][ready]
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[root@RKDB01 Server]#
6、重启服务器后，我们可以看到多路径信息了：
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[root@RKDB01 ~]# ll /dev/mapper/
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总计 0
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crw------- 1 root root 10, 60 11-05 22:35 control
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brw-rw---- 1 root disk 253, 0 11-05 22:35 mpath1
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brw-rw---- 1 root disk 253, 1 11-05 22:35 mpath2
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[root@RKDB01 ~]# multipath -ll
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mpath2 (3600d02310000011b76128b9c63138cf4) dm-1 TOYOU,NetStor_iSUM510
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[size=3.2T][features=0][hwhandler=0][rw]
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\_ round-robin 0 [prio=2][active]
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\_ 1:0:0:1 sdc 8:32 [active][ready]
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\_ 1:0:1:1 sde 8:64 [active][ready]
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mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510
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[size=20G][features=0][hwhandler=0][rw]
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\_ round-robin 0 [prio=2][active]
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\_ 1:0:0:0 sdb 8:16 [active][ready]
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\_ 1:0:1:0 sdd 8:48 [active][ready]
7、通过fdisk 看可以生成了DM-0/DM-1两个盘，正是上面sdc/sde,sdb/sdd多路径后出来的：
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[root@RKDB01 ~]# fdisk -l
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Disk /dev/sda: 299.4 GB, 299439751168 bytes
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255 heads, 63 sectors/track, 36404 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Device Boot Start End Blocks Id System
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/dev/sda1 * 1 38 305203+ 83 Linux
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/dev/sda2 39 13092 104856255 83 Linux
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/dev/sda3 13093 19619 52428127+ 83 Linux
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/dev/sda4 19620 36404 134825512+ 5 Extended
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/dev/sda5 19620 26146 52428096 83 Linux
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/dev/sda6 26147 28757 20972826 83 Linux
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/dev/sda7 28758 30324 12586896 82 Linux swap / Solaris
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/dev/sda8 30325 36404 48837568+ 83 Linux
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Disk /dev/sdb: 21.4 GB, 21474836480 bytes
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255 heads, 63 sectors/track, 2610 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/sdb doesn't contain a valid partition table
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Disk /dev/sdc: 3568.4 GB, 3568429957120 bytes
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255 heads, 63 sectors/track, 433836 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/sdc doesn't contain a valid partition table
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Disk /dev/sdd: 21.4 GB, 21474836480 bytes
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255 heads, 63 sectors/track, 2610 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/sdd doesn't contain a valid partition table
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Disk /dev/sde: 3568.4 GB, 3568429957120 bytes
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255 heads, 63 sectors/track, 433836 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/sde doesn't contain a valid partition table
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Disk /dev/dm-0: 21.4 GB, 21474836480 bytes
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255 heads, 63 sectors/track, 2610 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/dm-0 doesn't contain a valid partition table
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Disk /dev/dm-1: 3568.4 GB, 3568429957120 bytes
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255 heads, 63 sectors/track, 433836 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Disk /dev/dm-1 doesn't contain a valid partition table
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Disk /dev/sdf: 4009 MB, 4009754624 bytes
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255 heads, 63 sectors/track, 487 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Device Boot Start End Blocks Id System
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/dev/sdf4 * 1 488 3915744+ b W95 FAT32
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Partition 4 has different physical/logical endings:
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phys=(486, 254, 63) logical=(487, 125, 22)
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[root@RKDB01 ~]#
8、我们同时也可以在/dev/mapper目录中查看到多路径映射的信息：
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[root@RKDB01 ~]# ll /dev/mapper/
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总计 0
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crw------- 1 root root 10, 60 11-06 00:49 control
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brw-rw---- 1 root disk 253, 2 11-06 00:49 data-data001
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brw-rw---- 1 root disk 253, 0 11-06 00:49 mpath1
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brw-rw---- 1 root disk 253, 1 11-06 00:49 mpath2
9、参考:
Red_Hat_Enterprise_Linux-5-DM_Multipath-en-US.pdf
Red_Hat_Enterprise_Linux-5-DM_Multipath-zh-CN.pdf
Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf
Red_Hat_Enterprise_Linux-6-DM_Multipath-zh-CN.pdf
