On Tue, Aug 10, 2010 at 10:50:28AM -0700, Ask Bjørn Hansen wrote: > On Aug 10, 2010, at 4:30, Miroslav Lichvar wrote: > > I'm considering adding iburst to the pool.ntp.org servers specified in > > default ntp.conf in Fedora and RHEL distributions. > > > > Would that be acceptable? > > Hi Miroslav, > > First of all thanks for asking. > > I think it'd be acceptable -- if it will actually give you better > results I don't know.
Ok, thanks. The reason I'm asking is that some users are complaining that it takes too long to step the time after boot or after enabling the service. Also, it might reduce the number of users configuring ntpdate to run on boot. > > But ntpd with default minpoll and maxpoll intervals > > makes about 43-57 queries in the first hour, so I'd expect adding > > iburst will have only a minimal effect on an average server load. > > The exception would be if you have a whole cluster of servers > booting at the same time, using the same DNS servers and maybe even > NAT but still using the pool servers. To a limited number of > servers it'll look like an onslaught of requests coming from one IP > within a short timeframe. I'm not sure there is anything I could do to prevent this from happening. > > Also, the example on the usage page has four servers specified and > > later the document says to not use more than three servers. > > Where does it say 3? Fourth paragraph from the bottom here http://www.pool.ntp.org/en/use.html > The pool used to only have 3 hostnames but four is better for all > the usual reasons if you're running ntpd. Ok, I'll add fourth server to the config file. -- Miroslav Lichvar _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
