[ntp:questions] client configuration: it's sufficient 3 servers ?

[Rob]

Brian Utterback <brian.utterback at oracle.com> wrote:
> On 5/24/2013 5:27 AM, Rob wrote:
>> claim that 2 servers is not good because they may have different
>> time and you will not be able to tell which one is right, but in
>> a correctly configured ntp server it will normally not happen that
>> it serves wrong time without noticing it.
>
> You are missing the point that it is not the case that two different 
> servers may have different time, it is the case that they *will* have 
> different time. The only question is by how much. Obviously, the closer 
> together they are, the less the impact will be.

These are two servers within an organization.  They can be interconnected
with a "peer" line.  They should be closely together until one or both
of them get "unsynchronized", which the clients will notice.

Of course, with a LOCAL clock they will remain synchronized to LOCAL
and they can drift away from real time.