[ntp:questions] Local time sources
jwinius at umrk.nl
Sun May 9 19:29:23 UTC 2010
When configuring a typical ntpd system, the recommended minimum number of
server entries in ntp.conf for NTP time sources seems to be three,
apparently because this way ntpd can calculate an average time, eliminate
the server furthest from the average, and then still have two left for a
final selection that depends on other values, such as jitter.
However, what is the recommended minimum number for systems that only
work with local time sources, such as GPS devices and time signal radio
receivers, that each supply their own timing information as well? Is one
always enough, or are there still advantages other than redundancy in
having more than one?
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