[Beowulf] ntpd wonky?
gerry.creager at tamu.edu
Tue Feb 17 12:30:49 EST 2009
Greg Lindahl wrote:
> On Thu, Dec 11, 2008 at 11:01:31PM -0800, Bernard Li wrote:
>> Have you tried other pools eg. pool.ntp.org?
> That is stable for me. So it's not me, it's Red Hat's pool that's
> I see that CentOS switched to using ntp.org in 5.2, which I didn't
> automagically get thanks to rpm creating ntpservers.rpmnew, even
> though I hadn't modified the ntpservers file. Mmf.
After a network performance class at the Internet2 Joint Techs meeting
in early Feb, I ditched the centos/redhat pools, and have a bunch of
discrete entries in my ntp.conf file. The entries I'm using are seen below:
ntpstat is showing a fairly stable 0.5 ms jitter with a 37 ms offset
from an IRIG-locked system at owamp.hous.net.internet2.edu
The recommendation from the I2 geeks was to have at least 5 servers of
known stratum 1 capability.
I'm planning to put my own GPS-timed system into my network to
accommodate all my clusters.
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