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
[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 37017186 Preparing... ########################################### [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 37017186 Preparing... ########################################### [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 37017186 Preparing... ########################################### [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 on
lsmod |grep dm_multipath
[root@RKDB01 Server]# chkconfig --level 345 multipathd on [root@RKDB01 Server]# lsmod |grep dm_multipath dm_multipath 58969 0 scsi_dh 42561 1 dm_multipath dm_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 -ll mpath1 (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 0 crw------- 1 root root 10, 60 11-05 22:35 control brw-rw---- 1 root disk 253, 0 11-05 22:35 mpath1 brw-rw---- 1 root disk 253, 1 11-05 22:35 mpath2 [root@RKDB01 ~]# multipath -ll mpath2 (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:
[root@RKDB01 ~]# fdisk -l Disk /dev/sda: 299.4 GB, 299439751168 bytes 255 heads, 63 sectors/track, 36404 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 38 305203+ 83 Linux /dev/sda2 39 13092 104856255 83 Linux /dev/sda3 13093 19619 52428127+ 83 Linux /dev/sda4 19620 36404 134825512+ 5 Extended /dev/sda5 19620 26146 52428096 83 Linux /dev/sda6 26147 28757 20972826 83 Linux /dev/sda7 28758 30324 12586896 82 Linux swap / Solaris /dev/sda8 30325 36404 48837568+ 83 Linux Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdb doesn't contain a valid partition table Disk /dev/sdc: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdc doesn't contain a valid partition table Disk /dev/sdd: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdd doesn't contain a valid partition table Disk /dev/sde: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sde doesn't contain a valid partition table Disk /dev/dm-0: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/dm-0 doesn't contain a valid partition table Disk /dev/dm-1: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/dm-1 doesn't contain a valid partition table Disk /dev/sdf: 4009 MB, 4009754624 bytes 255 heads, 63 sectors/track, 487 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdf4 * 1 488 3915744+ b W95 FAT32 Partition 4 has different physical/logical endings: phys=(486, 254, 63) logical=(487, 125, 22) [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:
[root@RKDB01 ~]# ll /dev/mapper/ 总计 0 crw------- 1 root root 10, 60 11-06 00:49 control brw-rw---- 1 root disk 253, 2 11-06 00:49 data-data001 brw-rw---- 1 root disk 253, 0 11-06 00:49 mpath1 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