Re: [Qemu-devel] [PATCH 3/3] add live dumping capability

[Anthony Liguori]

Paolo Bonzini wrote:
> > > With the previous cleanups in place, it is easy to trigger
> > > restart when the state machine goes from the COMPLETING to the
> > > COMPLETED state. Besides this, the patch is just simple
> > > scaffolding for the monitor command and to migrate to a file
> > > rather than a pipe (which is a bit simpler because we do not
> > > need non-blocking I/O).
> >
> > Then this isn't live migration.
>
> Sorry, I cannot understand this remark.

You're using blocking I/O which will cause the guest to pause while disk 
I/O is happening.

If you want to see this in action, before running dump, type 
"migrate_set_rate 10G" in the monitor.  It only appears live now because 
the default rate limit is pretty close to the write speed of a typical disk.

Regards,

Anthony Liguori