FORCLIENTS clock has a huge frequency problem, way beyond what NTP can
correct.
Do this. Disable NTP on FORCLIENTS, then run ntpdate every minute (cron
would be good here) with "-q" and "-s". You will probably see an
increasing offset. Check to see if it is monotonically increasing. If it
occasionally resets or goes backward, then you probably have resync to
TOD chip and that may be part of the problem. Otherwise, take the offset
at the end and subtract the offset at the beginning then divide by the
time between the start and the end. That will give you the drift rate.
If that rate is larger than 500 parts per million, then NTP cannot
correct the clock.
On 05/21/13 07:57, Riccardo Castellani wrote:
I'm using n. 1 ntp server (XNTPD daemon on HP-UX, called FORCLIENTS,
192.168.1.240) for my clients and I'm obtaining the message
"synchronization
lost" about every 20 minutes.
Source time is another server (MASTER) on my lan
which updates its time
directly from Internet servers.
MASTER is OK
FORCLIENTS has a high offset !
ntp.conf of FORCLIENTS (192.168.1.240):
restrict default ignore
server 10.2.3.5
driftfile /etc/ntp.drift
restrict
127.0.0.1
restrict 127.127.1.1
restrict 10.2.3.5
restrict 192.168.1.240
restrict 192.168.0.0 mask 255.255.0.0 nomodify noquery
server 127.127.1.1
fudge
127.127.1.1 stratum 10 # show poor quality
ntp.conf of MASTER (10.2.3.5):
restrict default ignore
restrict 127.0.0.1
restrict 192.168.1.240 mask
255.255.255.255 nomodify
restrict ntp1.inrim.it mask 255.255.255.255 nomodify
noquery notrap nopeer
restrict ntp2.inrim.it mask 255.255.255.255 nomodify
noquery notrap nopeer
restrict ntp1.fau.de mask 255.255.255.255 nomodify
noquery notrap nopeer
restrict ntp2.nl.net mask 255.255.255.255 nomodify
noquery notrap nopeer
restrict 127.127.1.0 mask 255.255.255.255
server ntp1.
inrim.it
server ntp2.inrim.it
server ntp1.fau.de
server ntp2.nl.net
server
127.127.1.0
fudge 127.127.1.0
driftfile /var/lib/ntp/drift
My server log
shows:
20 May 14:38:20 xntpd[19386]: synchronized to LOCAL(1), stratum=10
20
May 14:39:23 xntpd[19386]: synchronized to 10.2.3.5, stratum=2
20 May 14:54:18
xntpd[19386]: time reset (step) -1.014343 s
20 May 14:54:18 xntpd[19386]:
synchronisation lost
20 May 14:58:35 xntpd[19386]: synchronized to LOCAL(1),
stratum=10
20 May 14:59:38 xntpd[19386]: synchronized to 10.2.3.5, stratum=2
20
May 15:14:33 xntpd[19386]: time reset (step) -1.010761 s
20 May 15:14:33 xntpd
[19386]: synchronisation lost
20 May 15:16:08 xntpd[13208]: logging to file
/var/adm/syslog/ntp.log
20 May 15:16:08 xntpd[13208]: tickadj = 625, tick =
10000, tvu_maxslew =
61875
20 May 15:16:08 xntpd[13208]: precision = 6 usec
20
May 15:17:29 xntpd[14031]: logging to file /var/adm/syslog/ntp.log
20 May 15:17:
29 xntpd[14031]: tickadj = 625, tick = 10000, tvu_maxslew =
61875
20 May 15:17:
29 xntpd[14031]: precision = 10 usec
20 May 15:21:46 xntpd[14031]: synchronized
to 10.2.3.5, stratum=2
20 May 15:21:46 xntpd[14031]: time reset (step)
-0.216182 s
20 May 15:21:46 xntpd[14031]: synchronisation lost
20 May 15:26:03
xntpd[14031]: synchronized to LOCAL(1), stratum=10
20 May 15:27:06 xntpd
[14031]: synchronized to 10.2.3.5, stratum=2
20 May 15:42:01 xntpd[14031]: time
reset (step) -1.005840 s
20 May 15:42:01 xntpd[14031]: synchronisation lost
20
May 15:46:18 xntpd[14031]: synchronized to LOCAL(1), stratum=10
20 May 15:47:21
xntpd[14031]: synchronized to 10.2.3.5, stratum=2
20 May 16:02:16 xntpd[14031]:
time reset (step) -1.009925 s
20 May 16:02:16 xntpd[14031]: synchronisation
lost
20 May 16:06:33 xntpd[14031]: synchronized to LOCAL(1), stratum=10
20 May
16:07:36 xntpd[14031]: synchronized to 10.2.3.5, stratum=2
nptd -qn shows:
remote refid st t when poll reach delay offset
disp
============================================================================
==
10.2.3.5 193.204.114.232 2 u 16 64 7 1.92 -158.96 3927.72
127.127.1.1
127.127.1.1 10 l 15 64 17 0.00 0.000
1885.01
My time source server is ok
(10.2.3.5) and I can exclude problems into my
lan.
remote local st poll
reach delay offset disp
=======================================================================
=ntp1.
nl.uu.net 10.2.3.5 1 1024 377 0.04411 -0.003625 0.12183
=ntp1.inrim.it 10.2.3.5
1 1024 377 0.01971 -0.000409 0.12172
*ntp2.inrim.it 10.2.3.5 1 1024 377 0.01923
-0.000046 0.12175
=LOCAL(0) 127.0.0.1 10 64 377 0.00000 0.000000 0.03072
=ntp1.
rrze.uni-e 10.2.3.5 1 1024 377 0.05191 -0.009084 0.12178
Can you indicate
suggestions please ? The problem is Offset bigger 128 ms
?!?! Offset is
increasing until to 700-800 ms.
I run ntpdate to update immediately clock and
I can see small offset but
after few minutes grows again until to exceed 128
ms.
How can I solve it ?
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--
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]
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