Re: [Xen-devel] xl save but leave domain paused

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-06-12 at 11:21 +0100, Ian Murray wrote:
> 
> > 
> > It seems like useful functionality to me, so subject to reviewing the
> > actual implementation I think it more than likely would.
> > 
> 
> 
> I see there is a longterm goal for snapshoting....
> 
> "
> 
> Full-VM snapshotting owner: ? status: none prognosis: Probably delay
> until 4.4 Have a way of coordinating the taking and restoring of VM
> memory and disk snapshots.  This would involve some investigation into
> the best way to accomplish this."
> 
> I don't know if my proposed solution meets that requirement. I would
> argue that snapshotting of the virtual disk is beyond the scope of the
> hypervisor tools because there are many different ways to implement a
> virtual disk, each with their own "snapshotting" methods....

I would imagine we would end up with something like having libxl support
callbacks for the relevant events and for xl to implement them as script
callouts and other toolstack to do whatever they need to do. But as the
goal says there needs to be some investigation of what the toolstack
want/need and what the best way to achieve things is.

> So perhaps it does meet the requirement.

I think it is at least complementary or orthogonal to it, and it seems
to me like useful functionality in its own right.

Ian.


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