[ntp:questions] confusing clock selection...

Chuck Swiger cswiger at mac.com
Fri Jul 8 17:49:43 UTC 2011


On Jul 8, 2011, at 10:27 AM, Florian Heigl wrote:
>> Don't do this, unless you absolutely need ntpd to freewheel in the absence of a reference time from the GPS receiver or other NTP servers for an extended period of time.
> 
> That's the case - if we lose all 4 reference clocks the NTP servers
> should still offer [the same] time to it's clients.
> 
> So the point is not directly about free-wheeling, but still delivering
> "the time" to anyone else.
> It's ok if ALL systems drift by 5s over a day, but not if one single
> system drifts 10s.


Set up your four machines as peers and use orphan mode instead of the local clock driver:

  http://www.eecis.udel.edu/~mills/ntp/html/orphan.html

Regards,
-- 
-Chuck




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