[ale] Time jumping forward on RHEL6.3

[Michael H. Warfield]

On Tue, 2012-11-20 at 19:03 +0000, Lightner, Jeff wrote:
> I specifically mentioned ntp in my post.   The issue occurred WITH ntp
> running last week and yesterday and apparently it was the issue
> occurring yesterday that caused ntp to abort because the time
> difference was too great which as I noted is likely the effect of
> having added the -x option (that is it didn't abort last week when I
> saw the time off).

> Since the time has continued to move ahead with ntp not running I
> don't believe this is an ntp issue.

If the jump happened yesterday (around 4 ish EST) it very definitely WAS
an ntp issue.  A server was rebooted at the Naval Observatory and,
somehow, reverted to the year 2000.  That spread through
tick.usno.navy.mil and tock.usno.navy.mil.  NANOG has reports of network
problems with ntp servers falling over and failing as well as problems
with Windows Active Directory failures.

Some vague details here:

https://isc.sans.edu/diary/Behind+the+Random+NTP+Bizarreness+of
+Incorrect+Year+Being+Set/14548

> I don't believe it is a battery issue because as I noted I rebooted
> the servers both last week and yesterday morning to verify the time it
> got after reboot is correct.
> 
> Since the system time is only set from hardware on boot, even if the
> hardware clock were off I wouldn't expect it to modify system time
> while the OS is running.   Also hwclock command has reported the
> correct time every time I've checked it so that wouldn't be the
> problem.   That is to say it isn't the hardware clock time that is
> jumping but rather the OS time as reported by the "date" command.
> 
> 
> 
> 
> 
> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of simontek at gmail.com
> Sent: Tuesday, November 20, 2012 1:30 PM
> To: Atlanta Linux Enthusiasts
> Subject: Re: [ale] Time jumping forward on RHEL6.3
> 
> Are you using ntp? If not, why not? Also could the battery be shot on the mobo?
> Sent via BlackBerry from T-Mobile
> 
> -----Original Message-----
> From: Brian MacLeod <nym.bnm at gmail.com>
> Sender: ale-bounces at ale.org
> Date: Tue, 20 Nov 2012 13:24:37
> To: <ale at ale.org>
> Reply-To: Atlanta Linux Enthusiasts <ale at ale.org>
> Subject: Re: [ale] Time jumping forward on RHEL6.3
> 
> On 11/20/12 11:26 AM, Lightner, Jeff wrote:
> >
> > 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.
> >
> 
> 
> I have not seen any indication of a time jump on any of our RHEL6 cluster nodes or VMs in the HPC environment here at GT. The last time I saw anything like that was on some older Sun equipment where the LOM had a known bug that after 536 days of continuous operation would wrap a counter and time would jump.  It was a DB server.  Yeah, fun.
> 
> Brian
> 
> 
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-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
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