Hi. Stratum levels define the distance from the reference clock (stratum 0, for example gps, atomic clock, ...).
A server that is directly connected to a stratum 0 clock is called a stratum 1 server. A stratum 2 server gets its time via NTP requests from a stratum 1 server and so on. NTP uses algorithms to pick the most accurate servers out of the list you provided in ntp.conf, so the stratum of your server can change depending on the server currently used for synchronization. You can use the ntpq -p command to list your current time sources and their strata. The one currently used for synchronization starts wih * and you will have stratum higher by one. It is fine for a pool server to be a stratum 3 or 4, as it is mostly about load balancing and higher stratum doesn't equal less accurate clock. Matej Snoha On Mon, Apr 23, 2012 at 20:11, IT2GO <[email protected]> wrote: > Dear, > > What does "stratum" exactly means? > I've set about 10 servers to the NTP pool, 8 of them has "stratum 2", one > has "stratum 3" and one became today "stratum 4". > Very strange, because that lasts server was "stratum 3". > > Kris > ______________________________**_________________ > pool mailing list > [email protected] > http://lists.ntp.org/listinfo/**pool <http://lists.ntp.org/listinfo/pool> >
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