[ntp:questions] Ntp not syncing after powerfail of server

Harlan Stenn stenn at ntp.org
Fri May 20 03:37:18 UTC 2011

Richard wrote:

> NTPD needs something like thirty minutes before it is able to serve a 
> reasonable facsimile of the correct time.  It needs up to ten hours 
> after startup to deliver the highest quality time that it is capable of.

Well, that's true for cold-start, with no drift file.  But it's not the
normal case, at least for a properly set-up and configured system.

I am used to seeing this reduced to 11 *seconds* if you have a good
drift file and run iburst.

> The corollary to this is that you can't expect NTPD to run 9 AM to 5 PM 
> and deliver the best possible quality of time.  If you want the best 
> possible accuracy, you run NTPD 24x7.



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