> De: questions [mailto:questions- > [email protected]] Em nome de Brian Inglis > > On 2015-07-02 13:40, Nuno Pereira wrote: > > But how can you explain that a client with just one source was better than a > > client with 4 sources? > > Okay as long as that single source is up and working and accurate - if it is > inaccurate, clinets would not know. A time island, which is acceptable, but without backup in case the source fails, which isn't optimal.
> > It's not just from this leap second situation: it's from some months where we > > have some clients with just one source that are having less problems that the > > 4 sources configuration. > > 4 is not odd, I know, but in that case I have to go for a 5 sources > > configuration, as a 3 source configuration can fall into a 2 available sources > > configuration if one of them fails? > > And as we prefer to use local sources, in order to have all of our clients > > with better accuracy between them, in that case we would need to have 5 > > servers of NTP! It's a little insane, in our opinion. > > Three local servers, plus two good external servers, plus a few good pool > servers > should allow your clients to get reliable time. Let ntpd do its own thing to get > accurate time. Collect loopstats and peerstats and compare consistency. That sounds good, except for one thing: our local servers get the minority, and so they may a better source, but some problem in the pool servers (as they happen a lot) or in the network, or some less accurate time in our local servers will bring us to a situation where our local clients have inconsistent time between them: some still use the local sources, some already went to the external ones. In other words, we prefer a time island than to have more accurate times. Isn't a peer source good in order to keep consistency between local servers? >From what I've tested, peer servers are discarded by the ntp algorithm (and marked with a "-" signal) and aren't used as time sources. > -- > Take care. Thanks, Brian Inglis > _______________________________________________ > questions mailing list > [email protected] > http://lists.ntp.org/listinfo/questions Nuno Pereira G9Telecom _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
