[Qemu-devel] Re: snapshot vs COW?

[walt]

Jun Koi wrote:
> Hi,
>
>  From what I see, both snapshot and COW features can be used to try
> some changes on the file image before we the change back to the
> original image.
>
> But what is the advantages of snapshot over COW, and in which case we
> should use snapshot, but not COW? Vice verse, when COW is more
> appropriate?
>
> Many thanks,
> Jun

COW is a nice feature but it is currently broken, so don't use it
until it gets fixed.  When you commit any changes your backing file
will be corrupted.