Re: [Qemu-devel] Issue with snapshot outside qcow2 disk - qemu 0.14.0

[Stefan Hajnoczi]

On Thu, Mar 10, 2011 at 9:32 AM, Jes Sorensen <address@hidden> 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.

Stefan