---- Original Message ----- > From: "Matthew Huff" <mh...@ox.com>
> 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. As I've noted, I had *nine* external peers; 3 shared by both machines (commercial and NIST strat-1's), and 3 each from us.pool, which were generally different servers; I did keep an eye on that. And the NTP servers were monitored. I'm stupid, but I'm not crazy. :-) Cheers, -- jra -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274