Re: [SLE] ntp failure
From: Dave Howorth (dhoworth_at_mrc-lmb.cam.ac.uk)
Date: 11/08/05
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To: suse-linux-e@suse.com Date: Tue, 08 Nov 2005 10:07:30 +0000
On Mon, 2005-11-07 at 19:21 +0100, Joachim Schrod wrote:
> E.g., my internal time server has the output
>
> remote refid st t when poll reach delay offset jitter
> ==============================================================================
> LOCAL(0) LOCAL(0) 10 l - 64 377 0.000 0.000 0.008
> *ntp2.ptb.de .PTB. 1 u 887 1024 377 44.424 0.697 0.826
> +rustime01.rus.u .DCFp. 1 u 968 1024 377 38.228 -2.858 0.927
> +hora.cs.tu-berl .PPS. 1 u 3 1024 377 48.561 -3.353 1.365
>
> This means I'm synchronized to PTB, and if that connection gets lost, rustime01
> and hora could take over. (All three servers are stratum 1 servers and give
> definitive times. PTB is the reference time source for Germany.)
I don't know your situation, but many readers of this list are
individuals rather than network administrators, so perhaps it's worth
pointing out for those who don't know that individuals should generally
not use stratum 1 servers. See for example:
http://ntp.isc.org/bin/view/Servers/RulesOfEngagement
"As the load on the hosts supporting NTP primary (stratum 1) time
service is heavy and always increasing, clients should avoid using the
primary servers whenever possible. In most cases the accuracy of the NTP
secondary (stratum 2) servers is only slightly degraded relative to the
primary servers and, as a group, the secondary servers may be just as
reliable. As a general rule, a secondary server should use a primary
server only under the following conditions:
1. The secondary server provides synchronization to a sizable
population of other servers and clients on the order of 100 or
more.
2. The server operates with at least two and preferably three other
secondary servers in a common synchronization subnet designed to
provide reliable service, even if some servers or the lines
connecting them fail.
3. The administration(s) that operates these servers coordinates
other servers within the region, in order to reduce the
resources required outside that region. Note that at least some
interregional resources are required in order to ensure reliable
service."
Cheers, Dave
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