[Pkg-xen-devel] Time problem in Xen domU's after kernel update

[Andy Smith]

Hi,

On Fri, Jul 31, 2009 at 08:34:48PM +0800, Thomas Goirand wrote:
> Paul van der Vlis wrote:
> > Now I have a problem with the time in the domU's. The time does not
> > change anymore. The time is different in the different domU's.
> > I don't use an independent_wallclock, so the time should be the same on
> > the dom0 and the domU's.
> > 
> > In the dom0 there is no problem.
> > 
> > Do other people have the same problem?

I've never had time synced reliably with dom0, on any hardware, with
any packaged version of Xen.  So  use independent_wallclock and ntpd
everywhere.

> We did have the issue, when rebooting the server, and the domU memory
> are saved in /var. As of writing, I'm unsure how to fix. Anyway, how to
> disable that save feature (that is working incorrectly) in the
> xend-config.sxp config file? Does anyone know?

After a save/restore especially, time is usually several hours
offset and ntpd dies as soon as the domain is unpaused.  I have to
make sure to start it again so it will slew time back to the correct
value.

Whether to save or shut down each domain is set in
/etc/default/xendomains.

Cheers,
Andy