Miroslav Lichvar wrote:
On Sun, May 09, 2010 at 09:33:46PM -0400, Richard B. Gilbert wrote:
Not three but four! If you have only three servers configured and
one fails you have the worst possible configuration. Is it not
written that a man with two clocks can never be certain what time it
is?
And to make him even less certain, give him a third clock! :)
I think in NTP world the saying is just confusing. If you care about
having accurate time, having two sources is actually better than one.
If they don't agree, you know something is wrong (ntpd will report
unsynchronized status) and you can do something about it. With only
one source you never know.
You know something is wrong but that is all you know! Clock A may be
wrong. Clock B may be wrong. Both may be wrong. You lack the
information necessary to determine what time it is.
The matter is discussed in some detail in the RFC and in more detail in
"Das Buch"!
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