Andy Yates wrote: > Does anybody have any figures that shows the effect on accuracy of an > NTP v3 client using a stratum 1 server rather than a stratum 2 or 3 > server? It's all in a GE LAN based scenario, commercial stratum 1 > servers connected to GPS and stratum 2 and 3 servers are typically > dedicated Linux boxes. > > The reasons is that I would rather scale by adding strata - its a very > big data center with thousands of clients and has several "zones" that > are isolated. However some opinion is suggesting we run IRIG-B between > the GPS receiver and a bunch of stratum 1 servers and clients access > these directly. Much more expensive and any increase in accuracy from > a client experience may be negligible. > > However I'm been pressed to supply an SLA for accuracy. My argument is > that although you can get your stratum one server to synchronize to > microseconds of UTP, as soon as the client uses NTP v3 over the LAN, > even a GE LAN, then the accuracy degrades and putting well designed > well specified stratum between the boxes is not going to decrease > accuracy sufficiently to warrant purchasing many stratum one > appliances. > > Thoughts? > > Regards > Andy
Andy, I think your approach is correct - no extra stratum-1 boxes. As Richard implies, the load on the network to the clients is perhaps the most important factor in accuracy. Questions: - why are you still using NTP v3? Isn't that rather old now? - what accuracy do your clients actually need? Are they Windows PCs or some other OS? Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
