Having to shut down Zimbra to make a backup is not ideal. I have been unable to find a good/detailed explanation as to why you need to stop Zimbra to make LVM snapshots for backup. I thought the whole point of LVM snapshots were to make consistent backups of running systems?
Create a snapshot logical volume (or snapshot) for an existing, so called original logical volume (or origin). Snapshots provide a ’frozen
image’ of the contents of the origin while the origin can still be updated. They enable consistent backups and online recovery of