[ntp:questions] GPS driver failure mode question
Charles Brown
charles.brown at sensis.com
Thu Jan 8 22:56:18 UTC 2009
This seems like it should be a common question, but I can't find it
on the Big I.
I have a processor with a serial GPS on a closed private network. If
the GPS is not locked, or the GPS inputs are missing, I still want the
ntpd to serve *some* time, perhaps from the undisciplined local clock.
I.e., the server can't just do nothing. Does the GPS driver do that
automatically, or do I have to configure two drivers in the ntpd.conf?
Perhaps something like;
prefer peer 127.127.20.u
peer 127.127.1.u
Suppose I have a second server, with a higher precision oscillator,
on this same network. How would I configure that? Perhaps;
prefer peer morePreciseServer # should be best source
peer 127.127.20.u # next is the GPS
peer 127.127.1.u # if all else fails....
What would the configuration on the other processor look like? Perhaps;
prefer peer 127.127.22.u # always best
peer 127.127.1.u # if GPS fails, still better for a
# couple of days
peer lessPreciseServer # GPS missing a long time,
# lessPreciseServer might have GPS
Should I coerce stratum values?
--CB
More information about the questions
mailing list