[ntp:questions] losing time fast
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Null at BlackList.Anitech-Systems.invalid
Fri Jul 13 20:18:56 UTC 2012
unruh wrote:
> Fritz Wuehler wrote:
>> That's all very nice but it says on the ntp.org page to
>> use a national server if you have one. Mine happens to
>> not be very good but that doesn't mean I shouldn't use
>> it if it was good.
>
> No idea where it says that, but if it does it is bad
> advice in your situation.
> IF you are a server for a bunch of other machines that
> really need accurate time (eg stock traders, airlines,etc)
> then it might be good advice.
> For a home user who has spent no time trying to figure
> out what his requirements are who sits on an adsl line say,
> it is terrible advice, since it clogs up the national server.
Geographicly Local Pool Servers (of any stratum):
<http://www.pool.ntp.org/en/use.html>
... <BlockQuote>
As pool.ntp.org will assign you timeservers from all over
the world, time quality will not be ideal.
You get a bit better result if you use the continental
zones (For example europe, north-america, oceania
or asia.pool.ntp.org), and even better time if you use
the country zone (like ch.pool.ntp.org in Switzerland)
- for all these zones, you can again use the 0, 1 or 2
prefixes, like 0.ch.pool.ntp.org.
</BlockQuote> ...
Hand configuration of Stratum One Servers
(instead of, or in addition to pool servers):
<http://support.ntp.org/bin/view/Servers/RulesOfEngagement>
<BlockQuote>
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:
The secondary server provides synchronization to a sizable population
of other servers and clients on the order of 100 or more.
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.
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.
</BlockQuote> ...
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