esm module and ntp problem

Michael Redinger Michael.Redinger at uibk.ac.at
Mon Jan 13 12:06:00 CST 2003


Well, it's almost the same but the values are far higher:

Jan 13 18:27:27 xxx ntpd[21517]: time reset 1.560781 s

However, this is definitely not normal:

- This does not (say: < once per month) happen to me on our PowerEdge 
  servers (if esm is not loaded).
- when synchronisation is lost, the server resets itself. Until the server 
  is in sync with its peers, it does not accept connections from clients.

In short: This is not acceptable if your server is a NTP server for 
some thousand clients.


Michael

On Mon, 13 Jan 2003, Brian Smith wrote:

> 
> If what you are referring to as "losing syncronization" is because you see
> lines like the following in /var/log/messages:
> 
> Jan 12 06:11:48 test1 ntpd[729]: time reset 0.165944 s
> Jan 12 06:11:48 test1 ntpd[729]: synchronisation lost
> Jan 12 09:17:00 test1 ntpd[729]: time reset 0.203586 s
> Jan 12 09:17:00 test1 ntpd[729]: synchronisation lost
> Jan 12 11:28:54 test1 ntpd[729]: time reset -0.170965 s
> Jan 12 11:28:54 test1 ntpd[729]: synchronisation lost
> 
> then I don't think you have to worry.  The NTP specifications define a
> syncronization loss to be any time the ntpd has to reset the time by more
> than 128 milliseconds.  Since PC-compatible clocks are notoriously bad at
> keeping time, almost every ntpd time-sync operation results in the above
> lines being printed to the /var/log/messages file.   At least that's how it
> is on all of our systems here.
> 
> If what you were referring to was something completely different, then
> please ignore this post.   :)
> 
> - Brian



> > Summary:
> > when esm kernel module is loaded on a 2650, the ntpd regularily looses
> the
> > synchronization. 100% reproduceable for me.
> 
> I have a PE500SC and am NOT running the esm module, byt my ntp loses
> synchronization every Monday morning just as my backup job is ending.  All
> RH8
> errata applied.  Search the list archives for details.  No joy so far... :
> -(
> 
> Later,
> JP


-- 
Michael Redinger
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Universitaet Innsbruck                  
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