Thanks Andy, I will probably do some simple test in sandbox to check clock 
synchronization. I am also reading [1] configuring NTP in both host and guests 
can help with synchronization, do you know if hosts in rackspace use hwclock 
for system time and NTP is enabled on them?

BR/Luis

[1] 
http://stackoverflow.com/questions/26005056/synchronizing-clock-time-in-host-and-guest-under-kvm

> On Apr 18, 2017, at 10:09 AM, Andrew Grimberg via RT 
> <helpd...@opendaylight.org> wrote:
> 
> On 04/18/2017 09:52 AM, Luis Gomez via RT wrote:
>> Forwarding the sync question helpdesk as I am not sure how the VMs get the 
>> time.
> 
> Instances get their time initialized by the underlying host upon boot.
> In many cases their "hardware clock" time may be hard stepped each time
> the instance gets sliced in to get an operation turn on the host.
> 
> It's possible to configure NTP on instances, but it's usually considered
> non-helpful in general as the time is still going to skew and the amount
> of skew really depends upon the load of the host system.
> 
> -Andy-
> 
>>> Begin forwarded message:
>>> 
>>> From: Robert Varga <n...@hq.sk>
>>> Subject: [integration-dev] Time sync between CSIT nodes
>>> Date: April 18, 2017 at 4:41:31 AM PDT
>>> To: "integration-...@lists.opendaylight.org" 
>>> <integration-...@lists.opendaylight.org>
>>> 
>>> Hello,
>>> 
>>> do the nodes participating in 3node cluster tests have their clocks
>>> synchronized?
>>> 
>>> The logs in https://bugs.opendaylight.org/show_bug.cgi?id=8075 seem to
>>> have some slight skew, but it's hard to tell whether it is natural lag
>>> in local event detection or the nodes have different times.
>>> 
>>> If not, would it be possible to establish NTP peering between the nodes,
>>> make sure the clocks are synchronized to a reasonable extent and output
>>> 'ntpq peers' at the end of the test?
>>> 
>>> Thanks,
>>> Robert
>>> 
>>> 
>>> _______________________________________________
>>> integration-dev mailing list
>>> integration-...@lists.opendaylight.org
>>> https://lists.opendaylight.org/mailman/listinfo/integration-dev
>> 
>> 
> 
> -- 
> Andrew J Grimberg
> Lead, IT Release Engineering
> The Linux Foundation
> 
> 
> <Mail Attachment>

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