On 30/05/2013 19:18, [email protected] wrote:
I have two servers in the same physical location that are syncing to the same
two NTP servers. My understanding is that these NTP servers are in the same
building as my servers, and we are connected via an in-building connection. In
other words, network jitter should be reasonably low (at least compared to the
Internet, for example).
My two machines are somewhat different: "oldbox" is running NTP 4.2.2 as ships with
RedHat 5.7; "newbox" is running NTP 4.2.4 as ships with RedHat 6.3.
Oldbox has been used as our company's central NTP server for many years. But
the machine is not dedicated to this purpose: it performs other business
functions that are erratic in nature. So we procured newbox to act as a
poor-man's dedicated NTP server. In other words, newbox does nothing but NTP.
What we've found is that newbox generally has a much larger offset to its NTP
peer, compared to oldbox. Likewise, newbox's offset also varies much more over
time.
[]
For a central server I would hope that you are using a really good clock
- such as the PPS signal from a GPS making that server stratum-1. I see
offsets usually less than 10 microseconds.
The current NTP is 4.2.6, and I am using the development version
4.2.7p368 on all of my PCs.
--
Cheers,
David
Web: http://www.satsignal.eu
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