Hi I am running 2 node mysql cluster on linux using ocsfs2 on top of drbd on top of a lvm volume Now I am trying to make a lvm snapshot og the lvm volume for backup. The snapshot creation is working fine, but I cannot mount it because the snapshot has the same uuid. I then tried to change the uuid on the snapshot with tunefs.ocfs2 --uuid-reset , but that is not succeeding - I think because the cluster thinks it is mounted(because the "original logical volumes" are mounted). Does anyone know a way to create a snapshot and then mount it without unmounting the original logical volumes? Best Regards Hasse H. Johansen