Hi sharfuddin,
Quote Originally Posted by sharfuddin View Post
if I have a cluster with either:
1 - dual primary drbd setup with cluster-aware file system(ocfs2) or
2 - shared storage with cluster-aware file system(ocfs2)

then why I do need the cLVM ? ordinary LVM does not work ?
changing the LVM layout from one of the cluster nodes will not be noticed by the other nodes, until a reboot.

If you can live with that (i.e. because you use a single OCFS2 partition on the shared media, and won't change the partitioning), no cLVM is needed.