Yes you are right we are running RHEL5. The strange thing is that when we try to sync the servers from a location that syncs correctly normally to the location with the issues then we get the same issues as the local servers are experiencing. You say that it could be conflicting time synchronisation mechanisms, do you mean that the 2 upstream servers are conflicting or that something other than NTP is causing this? Thank you for your help!
Thanks Adam -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Woolley Sent: 08 June 2008 10:20 To: questions@lists.ntp.org Subject: Re: [ntp:questions] NTP Sync Issues Adam Johnson wrote: > We have 3 sites and we are experiencing some strange problems in one of > the sites. We use NTP to keep the servers in time and this works fine > for 2 of the sites but in one of the site we get these errors in the log > > ntpd[30062]: synchronized to server, stratum 3 > ntpd[30062]: no servers reachable > ntpd[30062]: synchronized to server, stratum 3 > ntpd[30062]: time reset +2.119167 s > ntpd[30062]: synchronized to server, stratum 3 This happens either because of two conflicting time synchronisation mechanisms or lost interrupts. I guess you are running some Unix-like system, from the process numbers in the messages. People failing to identify such systems are usually running Red Hat Linux. Linux (and Windows) are vulnerable to losing clock interrupts, especially when using IDE devices in non-DMA modes. Red Hat, in particular, tends to set the kernel interrput rate to 1000 Hz, which tends to exacerbate this. The typical cause on other Unix systems, e.g. SunOS and at least some versions of SCO Unix, is software that resets the software clock from the real time clock. Tickless Linux systems are too new for much experience of failure modes to have been gathered. What one can reasonably say is that is is an OS or hardware issue, not an NTP one. _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions