多路径软件安装使用方法
服务器可以识别到存储的情况下，多路径软件安装好后，不需要重启服务器，启动多路径软件后，就可以看到存储的多路径别名/dev/mapper/wwid或/dev/mapper/别名
yum -y intall device-mapper-multipath
chkconfig --level 35 multipathd on
cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf
service multipathd start
multipath -v3
安装好multipath后，默认的multipath.conf路径是
/usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf
需要把该文件拷贝至/etc目录
cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf
如果多路径软件安装好后，不启动，fdisk看不到/dev/mapper目录下面的信息，
并且执行multipath -v3显示如下
[root@srmdb Packages]# multipath -v3
May 17 14:43:24 | DM multipath kernel driver not loaded
May 17 14:43:24 | DM multipath kernel driver not loaded
启动后，fdisk可以马上看到/dev/mapper目录下面的信息，multipath -v3也显示正常信息
[root@srmdb etc]# service multipathd status
multipathd is stopped
[root@srmdb etc]# service multipathd start
Starting multipathd daemon: [ OK ]
[root@srmdb etc]# multipath -v3
May 17 14:45:21 | ram0: device node name blacklisted
May 17 14:45:21 | ram1: device node name blacklisted
May 17 14:45:21 | ram2: device node name blacklisted
May 17 14:45:21 | ram3: device node name blacklisted
May 17 14:45:21 | ram4: device node name blacklisted
May 17 14:45:21 | ram5: device node name blacklisted
May 17 14:45:21 | ram6: device node name blacklisted
lun在应用服务器上显示为/dev/mapper/wwid
lun在应用服务器上显示为/dev/mapper/别名如/dev/mapper/sdbidb（默认的multipath.conf
就是显示别名，如果需要显示wwid，需要修改multipath.conf里面的配置）
配置好/etc/multipath.conf文件后，一般fdisk -l|grep /dev/mapper/就可以直接看到wwid了
[root@mesdg ~]# fdisk -l |grep /dev/mapper
Disk /dev/mapper/3600a098038303867635d4a48624e5465: 1099.5 GB, 1099529453568 bytes
yum -y intall device-mapper-multipath
chkconfig --level 35 multipathd on
cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf
service multipathd start
multipath -v3
安装好multipath后，默认的multipath.conf路径是
/usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf
需要把该文件拷贝至/etc目录
cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf
如果多路径软件安装好后，不启动，fdisk看不到/dev/mapper目录下面的信息，
并且执行multipath -v3显示如下
[root@srmdb Packages]# multipath -v3
May 17 14:43:24 | DM multipath kernel driver not loaded
May 17 14:43:24 | DM multipath kernel driver not loaded
启动后，fdisk可以马上看到/dev/mapper目录下面的信息，multipath -v3也显示正常信息
[root@srmdb etc]# service multipathd status
multipathd is stopped
[root@srmdb etc]# service multipathd start
Starting multipathd daemon: [ OK ]
[root@srmdb etc]# multipath -v3
May 17 14:45:21 | ram0: device node name blacklisted
May 17 14:45:21 | ram1: device node name blacklisted
May 17 14:45:21 | ram2: device node name blacklisted
May 17 14:45:21 | ram3: device node name blacklisted
May 17 14:45:21 | ram4: device node name blacklisted
May 17 14:45:21 | ram5: device node name blacklisted
May 17 14:45:21 | ram6: device node name blacklisted
lun在应用服务器上显示为/dev/mapper/wwid
lun在应用服务器上显示为/dev/mapper/别名如/dev/mapper/sdbidb（默认的multipath.conf
就是显示别名，如果需要显示wwid，需要修改multipath.conf里面的配置）
配置好/etc/multipath.conf文件后，一般fdisk -l|grep /dev/mapper/就可以直接看到wwid了
[root@mesdg ~]# fdisk -l |grep /dev/mapper
Disk /dev/mapper/3600a098038303867635d4a48624e5465: 1099.5 GB, 1099529453568 bytes
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/30126024/viewspace-2137512/ ，如需转载，请注明出处，否则将追究法律责任。
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