Maybe http://www.endruntechnologies.com/stratum1.htm ? Not used them, so I can't say if they are any good or not.
I wouldn't use a VM long-term for an NTP server. Note that the hardware clocks in most computers are pretty poor--lots of drift. I'd wager that a moderately cheap wristwatch keeps better time than many computer clocks (certainly in PC hardware, servers are probably better). On Thu, Apr 2, 2015 at 4:05 PM, rain doctor <[email protected]> wrote: > Jesse, > > No NTP servers as yet. Right now I am just running an ntp server in a VM. > Management wants reliable NTP servers, as we will support distrubuted > systems and kerberos, etc. Money is not a constraint. I am just looking for > recommendations for NTP appliances in the data center. > > Pedro Alvarez > > > On Thu, Apr 2, 2015 at 11:39 AM, Jesse Becker <[email protected]> wrote: >> >> If memory serves, the GPS receiver would be stratum 0. The daemon >> that interfaces it would be stratum 1. >> >> While I love Rasberry Pis, I wouldn't use them in this context without >> at least adding a big battery pack to run the thing (or UPS...), and >> proper a high-precision hardware clock. There are a bunch of >> commercial appliances out there as well. I've not used them, but in >> the context of "new datacenter", the cost should be a rounding error. >> >> If you have three devices, all getting the time from GPS signals, do >> you really have three canonical sources, or just one? >> >> Within the datacenter, it's more important that the computers have the >> same time relative to each other, rather than relative to the rest of >> the world. >> >> >> On Thu, Apr 2, 2015 at 2:09 PM, Brandon Allbery <[email protected]> >> wrote: >> > On Thu, Apr 2, 2015 at 2:02 PM, Mark Baker <[email protected]> wrote: >> >> >> >> Buy 3 raspberry Pis. I hate to see money thrown out the door for these >> >> "appliances". Piggy back on the DNS servers all you need to run is the >> >> daemon. >> > >> > >> > Wouldn't a stratum 1 NTP appliance be something like a GPS receiver that >> > outputs a clock signal, not just an NTP daemon synchronizing to some >> > other >> > NTP daemon (by definition that makes it stratum 2 or lower)? >> > >> > -- >> > brandon s allbery kf8nh sine nomine >> > associates >> > [email protected] >> > [email protected] >> > unix, openafs, kerberos, infrastructure, xmonad >> > http://sinenomine.net >> > >> > _______________________________________________ >> > Discuss mailing list >> > [email protected] >> > https://lists.lopsa.org/cgi-bin/mailman/listinfo/discuss >> > This list provided by the League of Professional System Administrators >> > http://lopsa.org/ >> > >> >> >> >> -- >> Jesse Becker >> _______________________________________________ >> Discuss mailing list >> [email protected] >> https://lists.lopsa.org/cgi-bin/mailman/listinfo/discuss >> This list provided by the League of Professional System Administrators >> http://lopsa.org/ > > -- Jesse Becker _______________________________________________ Discuss mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/discuss This list provided by the League of Professional System Administrators http://lopsa.org/
