[ntp:questions] NTP not syncing

Antonio Marcheselli puppa at me.la
Mon Nov 4 19:16:59 UTC 2013


On 04/11/2013 18:49, Charles Swiger wrote:
> Hi--
>
> On Nov 4, 2013, at 9:40 AM, Antonio Marcheselli <puppa at me.la> wrote:
>> Would it be wiser to delete the drift file at boot - by script - and let ntpd resync and recreate a new drift file?
>
> Normally, no.
>
> The drift file lets ntpd perform a first-order correction of the average intrinsic drift of the local clock even if ntpd can't get time from any other sources.  However, if the drift can't be computed correctly because of some unusual problem-- and a systemic drift of over 500ppm is fairly unusual-- then deleting the drift file might help.

Understood. I'll do some tests to find out whether with a better 
configuration the drift file still gets stuck to 500. In that case I'll 
have it deleted at each startup to see if things improve
>
>> As mentioned, I don't really need my system to be synced down to the millisecond, if ntpd takes a few hours to settle and the time is off up to a few seconds during that time it's perfectly fine with me.
>
> Gracious.  In that case, run ntpdate via cron every hour or so and you'll probably stay within that tolerance even if ntpd itself can't manage to stay in sync.  However, if switching your system's clock source from whatever you are using now to HPET, ACPI, etc improves matters so that ntpd remains stable, that would obviously provide much better timekeeping.

That is being considered. The server runs a maintenance procedure every 
24hours when all the services are stopped momentarily. It could be the 
right time for an ntpdate to run.

Thanks
Antonio



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