The LUV VM is now running BTRFS. I've setup a cron job to make read-only snapshots of the root filesystem. Such snapshots are atomic which means that the people who are making offsite backups of the server can rsync the MySQL data files without integrity problems. Also the filesystem has duplicate metadata to cover the case of corruption. The Dom0 is running Linux Software RAID-1 which saves us from a total disk failure but doesn't handle corruption at all. If data corruption hits the data blocks then we have to rely on offsite backups. BTRFS doesn't support duplicate data blocks (in any normal or desirable configuration) unlike ZFS which has the copies= configuration. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/