[ntp:questions] Re: Sufficient # servers to sync to

Brad Knowles brad at stop.mail-abuse.org
Sat Mar 19 00:41:33 UTC 2005

At 3:16 PM -0800 2005-03-18, David Schwartz wrote:

>      The assumption is that you have three servers, two of which are working
>  and one of which is not. If two of them are working, then their intervals
>  *must* overlap.

	They can't overlap, since it takes two machines to *define* an 
interval.  If you have three machines, you may have as many as two 
different intervals.  If one of those machines is insane, then you're 
back to the well-known two-machine problem.

>                   Obviously if you have three servers and no two of them are
>  reliable, you are screwed.

	You're pretty much screwed if you have just three servers and any 
one of them is unreliable.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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