關(guān)于Linux Multipath配置，網(wǎng)上還是很多的，自己再來梳理一下，當(dāng)前環(huán)境為RedHat6，HP P2000存儲(chǔ)

1. 安裝軟件。

查看是否安裝 rpm -qa |grep device-mapper

device-mapper-multipath-libs-0.4.9-31.el6.x86_64

device-mapper-event-libs-1.02.53-8.el6.x86_64

device-mapper-event-1.02.53-8.el6.x86_64

device-mapper-1.02.53-8.el6.x86_64

device-mapper-multipath-0.4.9-31.el6.x86_64

如果沒有安裝，請(qǐng)安裝，命令如下

# yum –y install device-mapper device-mapper-multipath

# chkconfig multipathd on

2. 初始化模塊。

# modprobe dm-multipath

# modprobe dm-round-robin

# lsmod |grep dm_multipath

dm_multipath??? 17756??? 3??? dm_round_robin

dm_mod????????? 82839??? 38??? dm_multipath,dm_mirror,dm_log

3. 查找 HBA 卡的 wwid.

# multipath -v3 | grep uid

Aug 14 09:39:30 | sda: getuid = /lib/udev/scsi_id --whitelisted --device=/dev/%n (controller setting)

Aug 14 09:39:30 | sda: uid = 3600c0ff0001982fa95fcfe5101000000 (callout)

Aug 14 09:39:30 | sdb: getuid = /lib/udev/scsi_id --whitelisted --device=/dev/%n (controller setting)

Aug 14 09:39:30 | sdb: uid = 3600c0ff0001982fa95fcfe5101000000 (callout)

uuid????????????????????????????? hcil??? dev dev_t pri dm_st chk_st vend/prod

4. 配置多路徑。

# vi /etc/multipath.conf

blacklist {

devnode "^sdc"

}

defaults {

user_friendly_names no

}

multipaths {

multipath {

wwid 3600c0ff0001982fa95fcfe5101000000

alias mpath0

path_grouping_policy multibus

path_selector "round-robin 0"

}

}

devices {

device {

vendor "HP"

product "Virtual disk"

path_grouping_policy multibus

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

path_checker readsector0

path_selector "round-robin 0"

}

}

5. 啟動(dòng)多路徑軟件。

# service multipathd start

# chkconfig multipathd on

# multipath -F????????????????????? # 刪除現(xiàn)有路徑。

# multipath -v2??????????????????? # 格式化路徑。

# multipath -ll??????????????????? # 查看多路徑，目前是主備模式。

mpath0 (3600c0ff0001982fa95fcfe5101000000) dm-0 HP,P2000 G3 SAS

size=9.1T features='1 queue_if_no_path' hwhandler='0' wp=rw

|-+- policy='round-robin 0' prio=130 status=active

| - 3:0:0:1 sda 8:0? active ready running

-+- policy='round-robin 0' prio=10 status=enabled

- 4:0:0:1 sdb 8:16 active ready running

6. 重啟測試。

# reboot

# multipath -ll????????????????? # 依然是主備模式。

# service multipathd start??????? # 再次重啟 multipathd.

# multipath -ll????????????????? # 變成主主模式。

size=9.1T features='1 queue_if_no_path' hwhandler='0' wp=rw

-+- policy='round-robin 0' prio=70 status=active

|- 3:0:0:1 sda 8:0? active ready running????????? # 需要重啟一次才會(huì)變成主主?

`- 4:0:0:1 sdb 8:16 active ready running

7. 創(chuàng)建用戶邏輯卷。

# pvcreate /dev/mapper/mpath0

# vgcreate -s 256m datavg /dev/mapper/mpath0

# lvcreate --size 2000G --name lv_src vg_data

# mkfs.ext4 /dev/mapper/vg_data-lv_src

# mkdir /src

# mount -t ext4 /dev/mapper/vg_data-lv_src /src

8. 負(fù)載均衡測試。

# cd /src

# dd if=/dev/zero of=test.img

# iostat 1

Device:??????????? tps? Blk_read/s? Blk_wrtn/s

sda??????????? 2020.00??????? 8.00??? 466272.00??? # 兩條線路都有數(shù)據(jù)傳輸，主主模式起作用。

sdb??????????? 2024.00??????? 0.00??? 368952.00??? # 如果只有一條線路傳輸數(shù)據(jù)，就是主備模式。

sdc????????????? 0.00??????? 0.00??????? 0.00

dm-0????????? 4044.00??????? 8.00??? 834776.00??? # 合并后的路徑，數(shù)據(jù)等于兩條。

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