[]
However, what is the recommended minimum number for systems that only
work with local time sources, such as GPS devices and time signal radio
receivers, that each supply their own timing information as well? Is one
always enough, or are there still advantages other than redundancy in
having more than one?
Thanks,
Jaap
Jaap,
I suspect that depends on the precision required. If you /need/ the
precision which the GPS provides, and an inaccurate time is unacceptable,
then add no other sources. If serving time at a reduced accuracy is
acceptable, add four or five external servers for redundancy. In addition
to redundancy, another advantage might be that you get a check that you
aren't working on the wrong edge of the GPS pulse, by looking at the
output of ntpq -p, and seeing that the offset of the backup sources is
reasonable.
BTW: depending on the version of NTP you are using, you may need to force
the external servers to have minpoll and maxpoll set to 10, so that the
external servers are not polled at one minute intervals (or less!). I
think 4.2.6 fixes that.
Cheer,
David
_______________________________________________
questions mailing list
questions@lists.ntp.org
http://lists.ntp.org/listinfo/questions
