On 03/10/11 10:58, Stefan Hajnoczi wrote: > On Thu, Mar 10, 2011 at 9:32 AM, Jes Sorensen <jes.soren...@redhat.com> wrote: >> On 03/10/11 10:27, Stefan Hajnoczi wrote: >>> I have CCed Jes who has been working on a live snapshot mechanism. He >>> recently added the snapshot_blkdev monitor command that takes a >>> snapshot of a block device while the VM is running. A new image file >>> is created based off the original image file (which will no longer be >>> modified), all new disk writes go to the new image file. It is safe >>> to perform read-only access to the original image file. There >>> currently is no support to merge the snapshot changes back into the >>> original image while the VM is running, but I think that is the next >>> planned step. >> >> Yes, keep in mind that the live snapshot is only for external snapshot >> files, it doesn't deal with internal snapshots. > > Yep, that's why I'm interested in Saurav's use case. Many use cases > work with either internal or external snapshot but it depends on the > details.
Actually I think there's very little reason to keep internal snapshot support. It doesn't buy us much, but it adds unnecessary complexity. Cheers, Jes
