[ale] Time jumping forward on RHEL6.3

[Lightner, Jeff]

Last week I noticed the time on two new servers we installed with RHEL6.3 had jumped forward even though we had ntpd running and use local time sources here.  I reconfigured ntp then with RedHat’s GUI for same then verified the hwclock was updated (and not using UTC) then for good measure rebooted both to make sure the system time was still correct.

Yesterday morning I had set myself a reminder to re-verify and time was still OK on both servers.  I again rebooted to verify the system time was set properly on boot.

We were installing new software and it suggested adding the “-x” option to ntpd which we did and restarted ntpd.   I again verified time was still ok after that.

Last night I noticed that at some point the time had again leapt forward as it had last week.   This was by about 9 hours and 14 minutes.   It appears ntpd aborted (presumably due to the –x option that prevents skewing) due to large gap in time (720000).

This morning both servers are ahead by about 20 hours on system time even though ntpd has not been running since yesterday’s abort.

I’ve looked through all cron and anacron files and can’t find anything that would be setting time automatically.

A ticket has been opened with RedHat support but I’m wondering if anyone has seen something like this and has any ideas what might be causing it or how to prevent it.  We’ll be running cluster software on these two nodes so having time synchronizes is especially important.

We do run many other RHEL (4, 5 & 6) servers as well as HP-UX and Windows servers and workstations all using our internal time devices as the NTP time source so I’m mystified as to why these two servers have the issue.









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