Re: [chrony-users] Isolated time domains

["Tomalak Geret'kal" <tom@xxxxxxxxx>]

On 03/12/2013 01:16, Bill Unruh wrote:
> On Tue, 3 Dec 2013, Tomalak Geret'kal wrote:
>
> > On 03/12/2013 00:58, Bill Unruh wrote:
> > > > >  In my test setup I have the master server's clock 
> > > set back about 3 hours >  and Chrony appears to be 
> > > working great and is moving time towards what >  is 
> > > reported by the external NTP servers:
> > >
> > >  Why? Is this a rediculous test? Why would you expect 
> > > the master server to
> > >  be 3
> > >  hours out?
> > Bill,
> >
> > I typically find testing the potentially unexpected to be 
> > a fairly worthwhile use of my time, certainly in critical 
> > systems.
>
> So, if for some reason your master were suddenly out by 3 
> hours, you would
> want all of the clients to also be out by 3 hours, and to 
> play catchup with
> the master (the clients would all lag, depending on their 
> poll intervals and
> times because the master is racing along with a huge 
> (>>500PPM) drift rate
> trying to fix its own offset. Your scenario would have the 
> clients far more
> scattered in time than if they were all discplined to UTC 
> all along.
>
> What error scenario do youhave in mind where the master 
> could suddenly find
> itself out by 3 hours?

You know, it's the unforeseen circumstances I like to 
prepare for. It's all well and good having some little list 
of scenarios that you know you can handle, but I prefer to 
have as robust a solution as I can, so that when the 
unexpected happens I have the greatest chance of recovery.

YMMV I suppose...

Tom

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