ocfs2 vs gfs

I am presently using ocfs2 managed by a pacemaker cluster on Debian Wheezy, and while it works great while everything is up, rebooting a node has mixed results, things really start to go south as on reboot another node will get upset and crash which has a bit of a cascade effect sometimes requiring manual intervention to resolve. Can anyone comment on their experience with gfs and/or ocfs2 and reliability? I'm using ocfs2 to store xen configs, and iso images for xen vm's, so performance really isn't a consideration while reliability is. Thanks James