Re: Server Time Protocol (Was: Re: SMPE 3.4)

"Edward E. Jaffe" <edjaffe@xxxxxxxxxxxx> wrote in message
news:<42EA2830.3050705@xxxxxxxxxxxxxxxxxxx>...
> Farley, Peter x23353 wrote:
>
> >PMFJI here, but isn't NIST time available via NTP to the microsecond or
> >better? ISTR they use an atomic clock to synchronize NIST, and the
accuracy
> >is quite high (or so I was led to believe).
> >
> >
>
> z/OS systems in a sysplex must have synchronized TOD clocks. My
> understanding was that the precision of NTP was insufficient for this
> purpose I'm certainly no expert in this area, so I'll defer to IBM to
> explain the intricacies of STP when the time comes.
>
> --

AS I understand it, the requirement was that the TOD clocks were well
synchronized to eachother, not necessarily to some external time. The TOD
clocks in one machine were synchronized by architecture, synchronizing TOD
clocks in different boxes requires a local device, the sysplex timer. It has
a feature, optional and not required, to synchronize the TOD clocks under
its control to an exteral time source.

Kees.


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