<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 25, 2013 at 3:01 PM, Cole Robinson <span dir="ltr"><<a href="mailto:crobinso@redhat.com" target="_blank">crobinso@redhat.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 06/24/2013 02:18 PM, Ján ONDREJ (SAL) wrote:<br>
> Hello,<br>
><br>
> I have clock synchronization problems with Fedora 18/KVM host and windows<br>
> server guests. Different 64bit windows servers, all has some time<br>
> synchronization problems.<br>
><br>
> Some of them will slow down time until time difference is 60 seconds and<br>
> then clock is synchronizes from internet. But 60 seconds is a long time.<br>
> Kerberos authentication sometimes files due to time skew.<br>
><br>
> Some machines will run OK day or two, but then clock stops. After some<br>
> hours clock is synchronized again and continues to work properly.<br>
> Curious, that during time is stopped, server works properly (except kerberos<br>
> authentications, which is very time sensitive.<br>
><br>
> For example, attaching 2 graphs from 2 windows servers. They show time<br>
> difference measured by check_mk nagios plugin. 10k means 10000 seconds.<br>
><br>
> How I should set clock/time/NTP on these guests?<br>
><br>
> I have absolutelly no problems with Linux guests, they work perfectly.<br>
><br>
<br>
</div>Maybe try altering the guest config with:<br>
<br>
<clock offset='utc'><br>
<timer name='pit' tickpolicy='delay'/><br>
<timer name='rtc' tickpolicy='catchup'/><br>
</clock><br>
<br>
<a href="https://bugs.launchpad.net/nova/+bug/1011848" target="_blank">https://bugs.launchpad.net/nova/+bug/1011848</a><br>
<a href="https://bugzilla.redhat.com/show_bug.cgi?id=828332" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=828332</a><br>
<br>
virt-manager/virt-install should be doing this by default.<br>
<div class="HOEnZb"><div class="h5"><br>
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<a href="https://admin.fedoraproject.org/mailman/listinfo/virt" target="_blank">https://admin.fedoraproject.org/mailman/listinfo/virt</a></div></div></blockquote></div><br></div><div class="gmail_extra" style>Have you checked the clock of the hypervisor the guest is running on?</div>
</div>