> > * Like Case 2, the benefit isn't clear to me. In a scenario where you > > use both QEMU and LVM snapshots there is now an extra management > > overhead of cleaning up 2 snapshots instead of just 1 when the user > > wants to delete a snapshot. I think this will be a headache. > > > My understanding is internal snapshots is obvious fast in both deleting and > reading, and I have similar questions, Dietmar, could u tip more how you use > this case while 2 snapshot layer exist?
To be honest, I don't really understand what you talk about here. There are simply different storage types and file formats. There are several storage types with support for internal snapshots: * traditional qcow2 files on normal file system * newer file systems (zfs, btrfs) * lvm (new dm-thin pools) * RDB (ceph) * sheepdog * iSCSI and nexenta API *... And you simply want to allow an external library to create/remove the snapshot for you.
