[ntp:questions] question regarding NTP configuration for clusters, and "cluster time" stability

Richard B. Gilbert rgilbert88 at comcast.net
Fri Oct 2 01:20:09 UTC 2009


Harlan Stenn wrote:
>>>> In article <g3eipnih6t.fsf at bioch4012.bioch.ox.ac.uk>, Ian Dobbie <ian.dobbie at bioch.ox.ac.uk> writes:
> 
> Ian> How about setting up the system so that you have, say, 3 machines
> Ian> synced to UTC ...
> 
> 4 is better (and 5 may be better still).
> 
> If you have 3 and one dies, if the other 2 do not match then there is no
> clear majority clique to follow.
> 

Four, five, and seven are the magic number of servers that ensure 
surviving the failure of one, two, or three servers.  A failed server is 
one that either does not respond or responds with an incorrect time.




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