On Feb 7, 2014, at 10:56 AM, Matthew Huff <mh...@ox.com> wrote:

> Working in the financial world, the best practices is to have 4 ntp servers 
> (if not using PTP).
> 
> 1) You need 3 to determine the correct time (and detect bad tickers)
> 2) If you lose 1 of the 3 above, then you no longer can determine the correct 
> time
> 3) Therefore with 4, you have redundancy.
> 
> We have two Symmetricom Stratum 1 time servers synced via GPS  with Rubidium 
> oscillators,  and two RHEL 6 servers running ntpd for our 4 servers.
Having a number of NTP servers will help you detect false tickers which may be 
critical.

If you want something that is "cheap" as in you for your home, I can recommend 
this: ~$350 w/ antenna, etc..

http://www.netburnerstore.com/product_p/pk70ex-ntp.htm

You can get the whole thing going quickly.  Majdi has also had good luck with 
this unit (perhaps he wants to chime-in, heh pun unintended) regarding a few 
other devices.

If you ask politely off-list, I will point you at where one of these is that 
you can talk to (in Dallas at the Infomart for your low-latency config).

- Jared

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