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I have a requirement where I need two Suns (both Netra T1s) to have
their clocks close to each other during an experiment that lasts 4
hours. During this time, neither Sun will have internet access and they
will not be networked to each other.

I suspect if I sync them by NTP before the experiment starts, then they
will not drift by more than 500 ms over a 4 hour period. Does that seem
reasonable? Has anyone actually ever made medium term (few hours)
stability measurements of the clocks in Suns?

Dave wrote:
> I have a requirement where I need two Suns (both Netra T1s) to have
> their clocks close to each other during an experiment that lasts 4
> hours. During this time, neither Sun will have internet access and they
> will not be networked to each other.
>
> I suspect if I sync them by NTP before the experiment starts, then they
> will not drift by more than 500 ms over a 4 hour period. Does that seem
> reasonable? Has anyone actually ever made medium term (few hours)
> stability measurements of the clocks in Suns?

It would be quite easy to set up cron job to call ntpdate every 4 hours
and check the messages logged in /var/adm/messages.

One of my x86 boxes drifts by about 250mS/hour while another drifts by
about 10mS/hour.

--
Ian Collins.