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Re: [Xen-users] DomU clock out of sync


Ensure that ntpdate or ntpd is adjusting the hwclock in the dom0 as
this is what is passed through to guests.


On 14 May 2011 21:05, Dmitry Nedospasov <dmitry@xxxxxxxxx> wrote:
> Hey all,
> I was watching some logs on a domU today and i suddenly noticed that the
> timestamps were off by something on the order of 47 seconds. I was
> surprised because *I don't* run independent wall clocks. I checked
> some other domUs and the "drift" was also very close to that of the
> first domU.
> I also checked another dom0, Here the domUs were "only" out of sync by
> ~11 seconds.
> The dom0s are all debian squeeze with Xen 4.0.1-2. The domUs are also
> debian squeeze and utilizing PV with the ParaVirtOPs in the normal
> debian linux-image-2.6.32 kernel.
> I am currently using ntpdate (in cron.hourly) on my dom0s, could this be
> the problem? Is there a difference in the way ntpdate updates time the
> way ntpd does? IIRC ntpd updates time continuously, correct?
> Can someone explain why this would happen. Could this be caused by a
> xend restart?
> After googling, I'm surprised a best practice solution isn't listed on
> XenFaq...  considering how many users seem to be frustrated with this
> issue.
> All the best,
> D.
> --
> Dmitry Nedospasov <dmitry@xxxxxxxxx> -- Twitter: @nedos
> Web: http://nedos.net -- Github: http://github.com/nedos
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Kind regards,
Founder | Director
Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56
99 52 | Mobile: 0428 754 846

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