[libvirt] [PATCH] 514532 Fix man page, most operation are synchronous
Daniel Veillard
veillard at redhat.com
Fri Nov 20 15:11:15 UTC 2009
On Thu, Nov 19, 2009 at 06:02:26PM +0100, Daniel Veillard wrote:
> On Thu, Nov 19, 2009 at 04:34:12PM +0000, Daniel P. Berrange wrote:
> > On Wed, Nov 18, 2009 at 02:31:12PM +0100, Daniel Veillard wrote:
> > >
> > > -Most B<virsh> commands act asynchronously, so just because the B<virsh>
> > > -program returned, doesn't mean the action is complete. This is
> > > -important, as many operations on domains, like create and shutdown,
> > > -can take considerable time (30 seconds or more) to bring the machine
> > > -into a fully compliant state. If you want to know when one of these
> > > -actions has finished you must poll through virsh list periodically.
> > > +Most B<virsh> commands act synchronously, except maybe shutdown
> > > +and domain creation. In those case the fact that the B<virsh>
> > > +program returned, may not mean the action is complete and you
> > > +must poll through virsh list periodically to detect that the
> > > +operation completed.
> >
> > Shutdown is async, but domain creation is certainly supposed to
> > be synchronous. Of course the guest may immediately crash
> > so appear inactive again just after create returns
>
> Well I was also thinking that Create like Shutdown, the process is at best
> started in the Domain OS but completion can't be asserted just because
> the command started. I think the idea of creating the guess is also
> implicitely tied with the OS booting th the mind of users, and well
> their domain won't respond to requests for a little bit even if the
> create succeeded.
>
> > Thinking about it, I believe virDomainShutdown/Reboot, and the SetMemory
> > and SetVcpus are the only two APIs that are allowed to be async, because
> > they merely update the guest, but don't wait for it to react.
>
Okay, fixed the pod accordingly and pushed,
thanks !
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
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http://veillard.com/ | virtualization library http://libvirt.org/
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