On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: > But still you first need to stop all writes to the filesystem, then do a > sync, and then allow writing again - which is exactly what freeze does.
And with device-mapper, we were asked to support the taking of snapshots of multiple volumes simultaneously (e.g. where the application data is stored across more than one filesystem). Thin dm snapshots can handle this (the original non-thin ones can't). Alasdair
