[CentOS-virt] Time

[Akemi Yagi]

On Wed, Jan 2, 2013 at 12:53 AM, Robert Dinse <nanook at eskimo.com> wrote:
>
>      Friday, I moved our servers to a new co-lo facility and ran into an
> interesting problem with virtual machines.
>
>      I did an orderly shutdown of the CentOS 6.3 host, and it in turn suspends
> all the guests.  It took about an hour and a half to move and fire up the host.
>
>      The guests, being suspended, were then an hour and a half behind and it
> seems ntpd does not want to correct more than 1000 seconds of error so it would
> not automatically adjust the clocks.
>
>      I tried the -g argument which is supposed to override the 1000 second
> limit but it did not.  I ended up having to manually set the clocks close
> enough for ntpd to correct.
>
>      Since there is no hardware clock for the virtual machines to use when they
> boot, it seems that shutdown and reboot of the virtual machines probably would
> not have avoided this.
>
>      Any suggestions for addressing this particular scenerio other than having
> to manually set a bunch of clocks?

Maybe related to this bug report:

http://bugs.centos.org/view.php?id=5726

Not sure if the "tinker panic 0" trick works or not as a workaround
(see note  15092). No one has reported back with success or fail.

The bug was filed upstream but was closed as CANTFIX :

https://bugzilla.redhat.com/show_bug.cgi?id=821988

Akemi