[ntp:questions] Controlling the combine algorithm

David L. Mills mills at udel.edu
Mon Jul 4 21:56:21 UTC 2011


There is something wrong with the nomenclature in your message. By 
definition, the number of survivors is the number remaining after the 
cluster algorithm has completedd. This number is three by default, but 
can be changed using the minclock option. To reduce the numb er of 
survivors below three is generally a bad idea, but as I said, the option 
is available.

I don't understand what you mean by "it doesn't work". The maxclock 
option does not do what you want. It is intended for automatic 
configuration, where it specifies the maximum number of servers 
remaining after the preempt phase. For configured associations, this 
number is irrelevant.


Steve Kostecke wrote:

>On 2011-07-02, David L. Mills <mills at udel.edu> wrote:
>>The combine algorithm operates on the survivors of the cluster 
>>algorithm, as described on the "How NTP Works" page. The number of 
>>survivors can be set using the minclock option. I'm not sure why you 
>>want to do this, but the option is there.
>I've been having a discussion with someone who wishes to configure a
>large number of unicast time servers and restrict the number of
>survivors to a number below the default. He was attempting to accomplish
>this using maxclock option, but it did not work.

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