[Linux-cluster] Add a fence device of type SUN ILOM

[Maciej Bogucki]

> As the GFS file system is not accessible when I'm rebooting one of the
> three nodes, I'm realizing the importance of fence devices.
It is strange to me, because if You have rc scripts and quorum properly
configured, and when You perform reboot of one node Your GFS filesystem
should be accesible all time.

Best Regards
Maciej Bogucki