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From Marcus Sorensen <>
Subject Re: [ACS41] System VMs not syncing time - does this block the release?
Date Wed, 15 May 2013 16:48:20 GMT
Just the general one that system vms sync their time to the
hypervisor, thus admins need to keep the hypervisor time correct. It
sounds like that will be the case for all three, if we can manage it.

On Wed, May 15, 2013 at 10:44 AM, John Burwell <> wrote:
> Marcus,
> Excellent.  So, it looks like we have KVM resolved.  We just need to address Xen and
VMWare now.  Do you think we need to any guidance to the documentation regarding KVM time
keeping (e.g. environmental prerequisites)?
> Thanks,
> -John
> On May 15, 2013, at 12:39 PM, Marcus Sorensen <> wrote:
>> KVM LibvirtComputingResource has been patched in master. Tested on
>> master, 4.1, and both the acton and current system vm templates. This
>> patch makes system vms use 'kvmclock' for their timer, which is a vm
>> driver that gets it's time from the hypervisor. No change to the
>> system vm template itself.
>> bfc5887a1bf6b41e88dd7a8f9987fcee8d3d9175
>> On Wed, May 15, 2013 at 9:08 AM, Chip Childers
>> <> wrote:
>>> On Wed, May 15, 2013 at 11:03:16AM -0400, John Burwell wrote:
>>>> Chip,
>>>> One other item I neglected to mention was that clock sync, at least for Xen
system VMs, wasn't an issue in the Jan-Feb timeframe.  Previously when I encountered these
issues, syncing the host's clock and rebuilding the system VMs addressed the issue.  I assumed,
but never verified, that the SSVM was syncing back against the host's clock through hypervisor.
 During my testing yesterday, aside from hard setting the clock, I was unable to force clock
sync on the SSVM.
>>>> Thanks,
>>>> -John
>>> I think that's our issue right now...  answering the question: Why is
>>> this only an issue now?  Did we just get lucky up to this point?  Since
>>> the SSVMs are the same template as the timeframe you mention, I tend to
>>> believe that you / we were just lucky.
>>> Anyone else have thoughts?
>>>> On May 15, 2013, at 10:18 AM, Chip Childers <>
>>>>> Starting a thread on this specific issue.
>>>>> CLOUDSTACK-2492 was opened, which is basically the fact that the System
>>>>> VMs aren't syncing time to the host or to an NTP server.  The S3
>>>>> integration is broken because of this problem, and therefore could not
>>>>> be considered a function available in 4.1 if we release as is.
>>>>> We need input from people that know about the current system VMs (the
>>>>> 3.x VMs), as well as the possibility of using the newer ones that we
>>>>> have been considering experimental for 4.1.0.
>>>>> What should we do?
>>>>> -chip

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