Hi all, For this sentence "You also minimize your exposure to other people's mistakes and disasters.", you can choice an specific appliance. i think it's better choice for all (security and same for NTP). There is many industrial shop for this, with GPS, quartz, and for INTERNET to DMZ (PPC, IRIG-B, 10 Mhz...) :
Jtelec.fr (fr/GB), Meinberg (de/GB) ... etc Best regards 2010/8/2 Richard B. Gilbert <[email protected]> > konsu wrote: > >> Hello list, >> >> I work for an investment bank with 300 UNIX servers, around 3000 >> workstation PCs and would like to ask some questions to more >> experience users. >> >> a) Are there any banks relying on ntp pool project or should we >> consider having our own GPS clock ? >> > > Ask a banker. For most of us the question is out of our area of expertise! > > b) What are the criteria to consider in deciding when ntp pool project >> is enough for our needs ? >> > > 1. Availability > 2. Reliability > 3. Distance from your site. Absurd example: If you are in New York City, > you would NOT want to configure a server in Tokyo! > > c) Should we decide to use ntp, for an organization of our size would >> 2 servers syncing to ntp pool project in DMZ and 2 servers inside to >> which all UNIX servers + Domain Controller will sync (PCs would sync >> to the Domain controller) suffice ? >> > > I would suggest that you consider purchasing a GPS Timing Receiver and > installing it. If you can site an antenna smaller than a hockey puck > somewhere within reach and with a good view of the sky, and connect it to > your receiver and your receiver to your computer you will have your very own > Stratum 1 server. You also minimize your exposure to other people's > mistakes and disasters. > > Don't use two servers! It is written that a man with two clocks can never > be certain what time it is. Four servers is generally regarded as the > minimum. A configuration of five servers can survive the failure of two > servers and a configuration of seven servers is able to survive the failure > of three. > > Failure, in this context, can mean either not responding or responding with > an incorrect time. The last NTP survey found one server that responded with > the wrong year!! This sort of thing does not happen often; that survey > covered several thousand NTP servers and most of the world. > > _______________________________________________ > questions mailing list > [email protected] > http://lists.ntp.org/listinfo/questions > -- ----~o00o-----//{ ´°`(_)´°` }\\-----o00o~------ Laurent Archambault Under Linux _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
