Re: [Qemu-devel] [PATCH for-3.0 2/4] migration: disallow recovery for release-ram

[Peter Xu <peterx@redhat.com>]

On Tue, Jul 24, 2018 at 11:21:47AM +0200, Juan Quintela wrote:
> Peter Xu <peterx@redhat.com> wrote:
> > Postcopy recovery won't work well with release-ram capability since
> > release-ram will drop the page buffer as long as the page is put into
> > the send buffer.  So if there is a network failure happened, any page
> > buffers that have not yet reached the destination VM but have already
> > been sent from the source VM will be lost forever.  Let's refuse the
> > client from resuming such a postcopy migration.  Luckily release-ram was
> > designed to only be used when src and destination VMs are on the same
> > host, so it should be fine.
> >
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> 
> Reviewed-by: Juan Quintela <quintela@redhat.com>

Thanks.

> 
> I wonder if we should have a FAQ somewhere and point an URL to there.

Yeah we possibly should.  I have plan to write up a postcopy recovery
wiki page, maybe an addon to the old postcopy wiki page, but I haven't
yet started (especially after knowing that libvirt developers know
well about how to use it already, hence I put that a lower
priority...).

Regards,

-- 
Peter Xu