[ale] Time jumping forward on RHEL6.3

Tue Nov 20 13:49:21 EST 2012

I have same version as you on vm and ntp server (centos 6.3).
I've seen vm time lag due to variable cpu ticks but it's never off more
than 3-5 minutes on the VMs.
On Nov 20, 2012 12:17 PM, "Lightner, Jeff" <JLightner at water.com> wrote:

>  Interesting you mention VMs – the first question RedHat asked me was
> whether these are Virtual or Bare Metal (they are the latter).   The tech
> indicated he’d seen some sort of issues with virtual machines in the past
> but didn’t elaborate.****
>
> ** **
>
> I’m wondering if it could have something to do with CPU frequency and if
> so how I’d go about checking that.****
>
> ** **
>
> Can you tell me what version of ntp you’re running on RHEL6.3?  I’m
> running the latest which is ntp.x86_64 4.2.4p8-2.el6. ****
>
> ** **
>
> I don’t really thing it’s an ntp issue though since it seems to have gone
> even further off after ntpd died yesterday.****
>
> ** **
>
> *From:* ale-bounces at ale.org [mailto:ale-bounces at ale.org] *On Behalf Of *Jim
> Kinney
> *Sent:* Tuesday, November 20, 2012 11:35 AM
> *To:* Atlanta Linux Enthusiasts
> *Subject:* Re: [ale] Time jumping forward on RHEL6.3****
>
> ** **
>
>
> Very strange. None of the rhel 6.3's I have are showing this at all. Then
> again, they are all VMs so things are quite different.
>
> I have not seen it on any of the Centos 6.3 physical systems either. Keep
> us posted.
>
> Take a B meson counter and turn it on. You may be having an issue with
> time reversal asymmetries :-)
>
>
> http://blogs.nature.com/news/2012/11/particle-physicists-confirm-arrow-of-time-for-b-mesons.html
>
>
> On 11/20/2012 11:26 AM, Lightner, Jeff wrote:****
>
> 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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