Re: clock skew

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> Op 1 april 2017 om 16:02 schreef John Petrini <jpetrini@xxxxxxxxxxxx>:
> 
> 
> Hello,
> 
> I'm also curious about the impact of clock drift. We see the same on both
> of our clusters despite trying various NTP servers including our own local
> servers. Ultimately we just ended up adjusting our monitoring to be less
> sensitive to it since the clock drift always resolves on its own. Is this a
> dangerous practice?

It can cause the Monitors to not being able to elect. Very far clock drifts can even cause cephx problems.

So yes, it can lead to downtime of your cluster.

The 50ms clock drift it allows by default should be enough and NTP should keep it below that.

Wido

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> On Sat, Apr 1, 2017 at 9:12 AM, mj <lists@xxxxxxxxxxxxx> wrote:
> 
> > Hi,
> >
> > On 04/01/2017 02:10 PM, Wido den Hollander wrote:
> >
> >> You could try the chrony NTP daemon instead of ntpd and make sure all
> >> MONs are peers from each other.
> >>
> > I understand now what that means. I have set it up according to your
> > suggestion.
> >
> > Curious to see how this works out, thanks!
> >
> >
> > MJ
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