Comment # 5 on bug 925564 from zhen ren

The following cmd works on remote nodes.

     udevadm trigger

which will reload udev, execute
/lib/udev/rules.d/60-persistent-storage.rules,and
create syslink in /dev.

```
n2:/dev/disk/by-label # udevadm trigger
n2:/dev/disk/by-label # ll
total 0
lrwxrwxrwx 1 root root 10 4���   3 15:09 multi-write_append_truncate-test ->
../../sdb1
```

But when trying to mount with this label, mount hangs up for a while(feel about
one minute), then brain-split happened to cluster, next, n1(local) reboot,
after a while, cluster go normal status, finally, mount return.

What's happened on earth is WIP.