在上一篇文章《multipath多路径实验01-构建iSCSI模拟环境》，我构建了iSCSI的模拟环境，在文章最后，已经成功配置并在主机上认出多个链路分别映射出的盘。而本文我就要对这样的多路径环境，通过Linux自带multipath多路径软件聚合成可以方便我们后期使用的形式。
•1.安装多路径软件包
•2.设置服务开机启动
•3.生成multipath配置文件
•4.multipath的常用命令
•5.udev绑定权限
•6.新建ASM磁盘组测试
1.安装多路径软件包
查询是否安装了多路径软件包：
rpm -qa |grep device-mapper-multipath
如果没有安装，则用yum安装即可：
yum install device-mapper-multipath
[root@jyrac1 ~]# yum install device-mapper-multipath
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package device-mapper-multipath.x86_64 0:0.4.9-72.el6 will be installed
--> Processing Dependency: device-mapper-multipath-libs = 0.4.9-72.el6 for package: device-mapper-multipath-0.4.9-72.el6.x86_64
--> Processing Dependency: libmultipath.so()(64bit) for package: device-mapper-multipath-0.4.9-72.el6.x86_64
--> Processing Dependency: libmpathpersist.so.0()(64bit) for package: device-mapper-multipath-0.4.9-72.el6.x86_64
--> Running transaction check
---> Package device-mapper-multipath-libs.x86_64 0:0.4.9-72.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
==================================================================================================================
Package Arch Version Repository Size
==================================================================================================================
Installing:
device-mapper-multipath x86_64 0.4.9-72.el6 ISO 116 k
Installing for dependencies:
device-mapper-multipath-libs x86_64 0.4.9-72.el6 ISO 180 k
Transaction Summary
==================================================================================================================
Install 2 Package(s)
Total download size: 297 k
Installed size: 653 k
Is this ok [y/N]: y
Downloading Packages:
------------------------------------------------------------------------------------------------------------------
Total 2.8 MB/s | 297 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : device-mapper-multipath-libs-0.4.9-72.el6.x86_64 1/2
Installing : device-mapper-multipath-0.4.9-72.el6.x86_64 2/2
Verifying : device-mapper-multipath-libs-0.4.9-72.el6.x86_64 1/2
Verifying : device-mapper-multipath-0.4.9-72.el6.x86_64 2/2
Installed:
device-mapper-multipath.x86_64 0:0.4.9-72.el6