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
Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf
Red_Hat_Enterprise_Linux-6-DM_Multipath-zh-CN.pdf