Jochen Bern wrote:
Hello everyone,
about 40h ago, I updated half a platform from CentOS 6.4 to 6.5, which
includes updating ntpd from ntp-4.2.4p8-3.el6.centos.x86_64 to
ntp-4.2.6p5-1.el6.centos.x86_64. One of the updated machines holds the
platform's Internet-bound NTP connections, and has some extra monitoring
for that - which now alerts us to the fact that by now, the driftfile
gets updated only every 6+ hours, rather than every hour (modulo sync
problems) as before.
A quick scan seems to confirm that the update frequency is tied to the
ntpd version running on the machines:
This is intentional, in order to lace less load on the hard drive/flash
drive of embedded/small servers. :-)
The update is written only if the delta in time or frequency is large
enough afair.
Terje
$ date ; for MACHINE in $INTERNETFACING ; do echo "" ; ssh $MACHINE \
"rpm -q ntp ; ls -l /var/lib/ntp/drift" 2>/dev/null ; done
Mi 18. Dez 19:03:06 CET 2013
ntp-4.2.6p5-1.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 15:18 /var/lib/ntp/drift
ntp-4.2.6p5-1.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 18:20 /var/lib/ntp/drift
ntp-4.2.4p8-3.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 18:11 /var/lib/ntp/drift
ntp-4.2.4p8-3.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 18:29 /var/lib/ntp/drift
ntp-4.2.4p8-3.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 18:21 /var/lib/ntp/drift
ntp-4.2.6p5-1.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 14:13 /var/lib/ntp/drift
ntp-4.2.6p5-1.el6.centos.x86_64
-rw-r--r--. 1 ntp ntp 7 18. Dez 13:22 /var/lib/ntp/drift
Is this change of behavior intentional?
Kind regards,
J. Bern
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
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