[time-nuts] Does GPS time reception work everywhere all of thetime?

Bob Camp lists at rtty.us
Tue Aug 31 13:12:29 UTC 2010


Hi

On the other hand, NTP gets bothered if it has only 2 independent partners.
It's quite happy with one, but two seems to bother it. Three or four seems
to be a "sweet spot".

-------------------

Still beating on the email problem... seems to be a router somewhere in Ohio
or Illinois that's the issue. May get fixed some day, until then no incoming
email. 

Bob

=============
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, August 31, 2010 4:58 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Does GPS time reception work everywhere all of
thetime?

In message <4C7CC2F1.3060604 at orange.fr>, mike cook writes:

>of references about how to do this in a belt and braces manner. How far 
you go (5 independent clocks should be sufficient) depends on how much 
>your downtime costs.

Let me just add a bit of caution here:  The NTP software gets confused
if it has too many servers to select from.

I would _never_ advice configuring more than 5 ntp servers for any
machine, unless some of them deliberately are made unavailable and
only used for monitoring/sanity-check.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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