You can't. The PPS feature can only use offsets up to .5 seconds. If the
offset is greater than .5 the PPS will synchronize your system to the
wrong second. In essence the PPS just locks the clock to the nearest
second. So NTP PPS is designed to require another source of time and
then on let the PPS kick in when the offset is below .5 seconds. If you
circumvent that requirement, you run the rather high risk of being some
integer multiple of seconds offset from the real time.
On 01/15/13 13:48, Edward T. Mischanko wrote:
How do I configure NTPD so that only the PPS offset is used to figure
the clock offset, instead of factoring in the surviving back-up
servers that have bigger offsets? I only want the back-up servers to
come into play when, or if, the PPS fails.
#
enable pps
enable kernel
enable ntp
tos minclock 4
tos minsane 3
tinker huffpuff 7200
#
driftfile "/var/db/ntpd.drift"
leapfile "/usr/home/ed/leap-seconds"
#
enable stats
statistics loopstats
statsdir "/usr/home/ed"
filegen loopstats file loop type day
#
server 127.127.20.0 mode 18 minpoll 3 prefer
fudge 127.127.20.0 time2 0.374000
server 127.127.22.0 minpoll 3
fudge 127.127.22.0 flag2 0 flag3 1
server 192.168.1.254 iburst minpoll 6 maxpoll 6
server tick.cerias.purdue.edu iburst minpoll 6 maxpoll 6
server tock.cerias.purdue.edu iburst minpoll 6 maxpoll 6
server tack.cerias.purdue.edu iburst minpoll 6 maxpoll 6
server nist1-chi.ustiming.org iburst minpoll 6 maxpoll 6
server nist.expertsmi.com iburst minpoll 6 maxpoll 6
server nist.netservicesgroup.com iburst minpoll 6 maxpoll 6
server ntp.your.org iburst minpoll 6 maxpoll 6
server navobs1.wustl.edu iburst minpoll 6 maxpoll 6
server utcnist2.colorado.edu iburst minpoll 6 maxpoll 6
server time-a.timefreq.bldrdoc.gov iburst minpoll 6 maxpoll 6
server ntp1.conectiv.com iburst minpoll 6 maxpoll 6
server east-pool.ustiming.org iburst minpoll 6 maxpoll 6
#
_______________________________________________
questions mailing list
[email protected]
http://lists.ntp.org/listinfo/questions
--
blu
Always code as if the guy who ends up maintaining your code will be a
violent psychopath who knows where you live. - Martin Golding
-----------------------------------------------------------------------|
Brian Utterback - Solaris RPE, Oracle Corporation.
Ph:603-262-3916, Em:[email protected]
_______________________________________________
questions mailing list
[email protected]
http://lists.ntp.org/listinfo/questions
