centos 6.7 识别IBM v3700 存储

配置IBM V3700存储

创建池

创建卷

添加主机（本公司采用光纤）

映射卷到主机

操作系统层操作

linux 识别存储空间必须重启

一、确保安装以下的包：

rpm -qa "*device*"

device-mapper-event-libs-1.02.74-10.el6.x86_64
device-mapper-1.02.74-10.el6.x86_64
device-mapper-event-1.02.74-10.el6.x86_64
device-mapper-libs-1.02.74-10.el6.x86_64
device-mapper-multipath-0.4.9-56.el6.x86_64
device-mapper-multipath-libs-0.4.9-56.el6.x86_64

二、编辑配置文件/etc/multipath.conf

要创建一个multipath.conf的配置文件，该文件在安装后不会自动创建。可以使用一个模板创建一个multipath.conf的文件。

vim   /etc/multipath.conf

# multipath.conf written by anaconda

defaults {
    user_friendly_names yes
}

blacklist {
    devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
    devnode "sdc"
}
multipaths {
    multipath {
        wwid 3600605b00befce701fdd673206f8774a
        alias IBMStorage001
        path_grouping_policy multibus
        path_selector "round-robin 0"
        failback manual
        rr_weight priorities
        no_path_retry 5
    }
}

三、加载并启动multipath模块和服务

# modprobe dm_multipath
# lsmod |grep dm_multipath
dm_multipath           17649  5 dm_round_robin
dm_mod                 81692  41 dm_multipath,dm_mirror,dm_log
 
# service multipathd restart  或 /etc/init.d/multipathd restart 
# chkconfig --level 345 multipathd on
# chkconfig --list | grep multipathd
multipathd      0:关闭  1:关闭 2:关闭  3:启用  4:启用 5:启用  6:关闭
# multipath -v3  // 装配多路径设备

四、检查multipath聚合后的设备名，以及设备对应的链路情况。

# multipath -ll    //显示当前多路径拓扑结构
Mar 17 11:37:06 | multipath.conf line 51, duplicate keyword: blacklist
Mar 17 11:37:06 | multipath.conf line 55, duplicate keyword: multipaths
mpathd (36005076300820fac1800000000000000) dm-11 IBM,2145
size=1.8T features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 5:0:1:0 sdf 8:80  active ready running
| `- 6:0:1:0 sdk 8:160 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 5:0:0:0 sde 8:64  active ready running
  `- 6:0:0:0 sdj 8:144 active ready running

以上的结果可以看出，每个磁盘设备对应的是4条链路。每个设备都有两个multipath设备名，分别是mpath[x]和dm-[x]，mpath位于/dev/mpath目录下，dm-[x]位于/dev目录下。

# cd /dev && ls dm*
dm-11  dm-12


# cd /dev/mapper/ && ll
lrwxrwxrwx. 1 root root      8 3月  15 21:08 mpathd -> ../dm-11
lrwxrwxrwx. 1 root root      8 3月  15 21:19 mpathdp1 -> ../dm-12

五、用fdisk -l命令也可以看到多路径软件创建的磁盘,multipath磁盘的基本操作,格式化分区

# fdisk -l
----------------------------------------------------------------------------------

/dev/mapper/mpathdp1               1      267350  2147483647+  ee  GPT
----------------------------------------------------------------------------------


# pvcreate /dev/mapper/mpathb
# parted /dev/mapper/mpathb
------------------------------------------------------------------------------------
GNU Parted 2.1
Using /dev/mapper/mpathdp1
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel gpt                　　　　#设置分区类型为gpt
(parted) mkpart extended 0% 100%   　　　　 #扩展分区，并使用整个硬盘
(parted) quit                       　　　　#退出                                               
Information: You may need to update /etc/fstab.
-------------------------------------------------------------------------------------------

# mkfs.ext4 /dev/mapper/mpathdp1
# mount /dev/mapper/mpathdp1 /pqsoft6

# vi /etc/fstab
/dev/mapper/mpathdp1    /pqsoft6                 ext4    defaults        1 2

六、路径切换测试

# cd /pqsoft6
# mkdir test
# cd test
# touch 123.txt
# echo "test " > 123.txt
# cat 123.txt
------------------------------------
test