[ntp:questions] Analyzing Loopstats

Danny Mayer mayer at gis.net
Tue Jul 12 13:08:53 UTC 2005


Jason C. Wells wrote:
> I have been dealing with loss of synchronization on and off for a while
> now.  I have captured loopstats and peerstats.  The data show what I
> already observed.  My clients will synch to my server for a few days
> or so and then reject the server.
> 
> The server itself has no problems remaining synched to tock.cs.unlv.edu.
> 
> The stability data is interesting.  The stability is fairly constant for
> about 5 days then trends up and down wildly and returns to near zero only
> after a reboot.  The thing that is odd is that there is any period of
> stability at all.  I would guess that unstable clock would be unstable all
> the time.
> 
> The other trends I see I think I can explain by system restarts and other
> interuptions.  (I am still learning how understand NTP correctly.)
> 
> I have imported my trend data into Excel to create graphs.  It seems to me
> that I might overlay data, perhaps stability and error, to determine cause
> and effect of my clients rejection of my server.  What are the first
> trends that the savvy NTP admins look at to determine the cause of
> problems?
> 
> Is there anything I can do to fix a stability problem?  Stated another
> way, is stability fixable by changing the system configuration?
> 
It would be helpful to see some of the data, knowing the O/S and version 
and knowing the version of ntpd that you are running. Also, what's in 
the drift file?

Danny
> Thanks,
> Jason C. Wells
> 
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