I'm talking about weeks at a time. Network connectivity goes down, ntp reverts to LOCAL clock, then if you look at the logs and check ntpq, it remains bound to the LOCAL clock, several weeks after the connectivity went down. A simple restart of ntpd brings the external clocks back online.
Cheers, Stephen -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of unruh Sent: Tuesday, November 09, 2010 3:36 AM To: [email protected] Subject: Re: [ntp:questions] Local clock - sync issue On 2010-11-09, David Woolley <[email protected]> wrote: > unruh wrote: > >> If I recall correctly his problem was that he had 4 outside sources plus >> the local time. Then something disconnected him from those outside >> sources for a long time ( hours) After that was fixed, the system never >> again went back to those outside sources-- gave zero reachability even >> after they were reconnected, as if ntpd gave up on them after it could >> not reach them for a while. >> > > It had fallen back to a 1024 second poll interval, so it might be as > simple as he failed to wait until a successful poll was made. He was > possibly expecting it to find the servers within tens of seconds. That is possible. Only he can tell us how long he waited. > > One could possibly argue that a response from another server, after > the > local clock became selected, ought to force the poll interval down. I think that ntp degrades the poll interval if there is not response, to prevent the situation where ntpd suddenly floods a server that has gone down. I think it used to decrease the poll interval which resulted in a server coming up being bombarded by thousands of ntp requests/sec, because everyone had decreased their poll interval. > > I don't know if ntpd handles the poll interval differently when there is > a local clock selected as against when there is no source, but it should > probably not. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions This email and any attachments may contain confidential and proprietary information of Blackboard that is for the sole use of the intended recipient. If you are not the intended recipient, disclosure, copying, re-distribution or other use of any of this information is strictly prohibited. Please immediately notify the sender and delete this transmission if you received this email in error. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
