[Linux-cluster] fence and lvm

[Shailesh <shailesh verismonetworks com>]

Hi,
      what are the uses of 'fenced' in a clustered environment where I
am not using any power device ?  Can you  elaborate any other uses.

      Is it possible to use 'lvm' (make logical volumes) in a RAID-5/6
disk array ? If so how are the parity blocks of RAID 5/6 taken care of
in the logical volumes.

Thanks & Regards 
Shailesh