RH linux 5.9 下做多路径聚合 问题,不知道怎样才算配置成功，路径聚合成功 (存储是HP EVA4400+ )

应该是配置成功了，楼上的网友回答得相当专业。

一般情况下，Linux配完multipath后用fdisk -l查看，重复的磁盘还是能看得到。应该看到的是n多个/dev/sd*和后来生出来的/dev/dm-*（与mpath*分别对应）。这点与Windows上有所不用，我记得Windows上配完多路径后是看不到重复的盘了。

你存储上有7个LUN的话，那应该是7个dm-*才对啊，怎么有8个呢？不解。。。

还有要注意的是：应该使用/dev/mapper/mpath*（multipath虚拟出来的多路径设备），对它进行分区等 *** 作。/dev/dm-* 是软件内部自身使用的，不要用。

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

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

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[root@RKDB01 Server]# chkconfig --level 345 multipathd on

[root@RKDB01 Server]# lsmod |grep dm_multipath

dm_multipath 58969 0

scsi_dh42561 1 dm_multipath

dm_mod102417 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：

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defaults {

udev_dir/dev

polling_interval10

selector"round-robin 0"

path_grouping_policymultibus

getuid_callout "/sbin/scsi_id -g -u -s /block/%n"

prio_calloutnone

path_checkerreadsector0

rr_min_io 100

max_fds 8192

rr_weight priorities

failbackimmediate

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

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#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：

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[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：

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[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：

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[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 1961952428127+ 83 Linux

/dev/sda4 19620 36404 134825512+ 5 Extended

/dev/sda5 19620 2614652428096 83 Linux

/dev/sda6 26147 2875720972826 83 Linux

/dev/sda7 28758 3032412586896 82 Linux swap / Solaris

/dev/sda8 30325 3640448837568+ 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：

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[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

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