Comment 5 for bug 802770

Should be, but you could also make sure by:

update-rc.d -f o2cb remove
update-rc.d o2cb disable

The only thing that I can imagine atm is that for some reason when creating the cluster it caught the o2cb one instead of the cman one. You should make sure ocfs_controld.cman is running as well as the dlm, and reformat the drives to try to get the new stack on the filesystem, since the update is not working.