Re: [Qemu-devel] qcow2: online snasphots : internal vs external ?

[Paolo Bonzini]

Il 27/08/2012 11:04, Stefan Hajnoczi ha scritto:
>> > Also I see that snapshot_blkdev qmp command give in his description:
>> > "Otherwise the snapshot will be internal! (currently unsupported)."
>> >
>> > is Live internal snapshots on the roadmap ?
> I'm not aware of anyone working on adding internal snapshot in the
> near future.  Patches are welcome.

The main problem with internal snapshots is that it's difficult to work
with two snapshots at the same time, especially if you need to write to
two of them.  IIUC this is why people concentrated more on external
snapshots.

It's not intrinsic to internal snapshots, more like a wart of the
implementation, but not an easily fixed one.

Paolo