Re: [Qemu-block] [Qemu-devel] [PATCH v5 00/12] Dirty bitmaps migration

[Fam Zheng]

On Tue, 01/26 17:57, John Snow wrote:
> Can we implement a function that, in the event of a disaster, compares
> the current state of the drive with the last known good incremental and
> populates a bitmap based on the difference?
> 
> Actually, we probably really want this feature around regardless. It'll
> allow us to start incremental backup chains from full backups made
> before we even knew we wanted to start making them.
> 
> Something like:
> 
> block-dirty-bitmap-diff node=drive0 name=bitmap0 target=/path/to/file
> 
> I like this idea, I think I'll prototype just this little piece, since
> it's useful even without postcopy bitmap migration.

Good idea!  It looks like another type of block job.

Fam