1、安装多路径软件包：device-mapper-1.02.67-2.el5device-mapper-event-1.02.67.2.el5device-mapper-multipath-0.4.7-48.el5
[root@RKDB01 Server]# rpm -ivh device-mapper-1.02.67-2.el5.x86_64.rpm warning: device-mapper-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186Preparing… ########################################### [100%] package device-mapper-1.02.67-2.el5.x86_64 is already installed[root@RKDB01 Server]# rpm -ivh device-mapper-event-1.02.67-2.el5.x86_64.rpm warning: device-mapper-event-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186Preparing… ########################################### [100%] package device-mapper-event-1.02.67-2.el5.x86_64 is already installed[root@RKDB01 Server]# rpm -ivh device-mapper-multipath-0.4.7-48.el5.x86_64.rpm warning: device-mapper-multipath-0.4.7-48.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186Preparing… ########################################### [100%] 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 onlsmod |grep dm_multipath
[root@RKDB01 Server]# chkconfig –level 345 multipathd on[root@RKDB01 Server]# lsmod |grep dm_multipathdm_multipath 58969 0 scsi_dh 42561 1 dm_multipathdm_mod 102417 4 dm_mirror,dm_multipath,dm_raid45,dm_log[root@RKDB01 Server]#
3、配置multipathd 使其正常工作，编辑/etc/multipath.conf，，开放如下内容：
defaults { udev_dir /dev polling_interval 10 selector “round-robin 0” path_grouping_policy multibus getuid_callout “/sbin/scsi_id -g -u -s /block/%n” prio_callout none path_checker readsector0 rr_min_io 100 max_fds 8192 rr_weight priorities failback immediate no_path_retry fail user_friendly_names yes}blacklist { wwid 26353900f02796769 devnode “^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*” devnode “^hd[a-z]”}
4、并关闭如下内容
#blacklist {# devnode “*”#}#defaults { 27 # user_friendly_names yes 28 #}
5、完成之后执行如下命令发现多路径：
[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正在关闭multipathd 端口监控程序： [确定]正在启动守护进程multipathd： [确定][root@RKDB01 Server]# multipath -v2[root@RKDB01 Server]# multipath -v2[root@RKDB01 Server]# multipath -llmpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510[size=3.3T][features=0][hwhandler=0][rw]\_ round-robin 0 [prio=2][ena bled]\_ 1:0:0:0 sdb 8:16 [failed][ready]\_ 1:0:1:0 sdc 8:32 [failed][ready][root@RKDB01 Server]#
6、重启服务器后，我们可以看到多路径信息了：
[root@RKDB01 ~]# ll /dev/mapper/总计 0crw——- 1 root root 10, 60 11-05 22:35 controlbrw-rw—- 1 root disk 253, 0 11-05 22:35 mpath1brw-rw—- 1 root disk 253, 1 11-05 22:35 mpath2[root@RKDB01 ~]# multipath -llmpath2 (3600d02310000011b76128b9c63138cf4) dm-1 TOYOU,NetStor_iSUM510[size=3.2T][features=0][hwhandler=0][rw]\_ round-robin 0 [prio=2][active]\_ 1:0:0:1 sdc 8:32 [active][ready]\_ 1:0:1:1 sde 8:64 [active][ready]mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510[size=20G][features=0][hwhandler=0][rw]\_ round-robin 0 [prio=2][active]\_ 1:0:0:0 sdb 8:16 [active][ready]\_ 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：
不敢接受失败的人，往往是那些追求完美的人，
