rhel6.7
多路径设备名称不会在/dev/mapper/下出现。
[root@multipath]# ps -ef|grep udev
root 13769 12976 0 19:09 pts/2 00:00:00 grep udev
[root@zdatacell01 multipath]# start_udev
Starting udev: [ OK ]
[root@multipath]# ps -ef|grep udev
root 13801 1 3 19:09 ? 00:00:00 /sbin/udevd -d
root 15910 12976 0 19:09 pts/2 00:00:00 grep udev
多路径服务重新reload
[root@ multipath]# ls -l /dev/mapper/
total 0
lrwxrwxrwx 1 root root 7 Oct 29 19:09 disk01 -> ../dm-2
lrwxrwxrwx 1 root root 7 Oct 29 19:09 disk02 -> ../dm-3
lrwxrwxrwx 1 root root 7 Oct 29 19:09 disk03 -> ../dm-4
lrwxrwxrwx 1 root root 7 Oct 29 19:09 disk04 -> ../dm-5
原文：http://harryzhang.blog.51cto.com/10795906/1707595