You can configure mon server and crushmap like shown in this beautiful example:
http://www.sebastien-han.fr/blog/2013/01/28/ceph-geo-replication-sort-of/ четверг, 27 июня 2013 г. пользователь писал: > Hi, > > yes exactly. synchronous replication is OK. The distance between the > datacenter > is only 15 km. > > How do i configure this in the cruchmap? > > Best regards > > Joachim > > > > Von: Sage Weil <[email protected] <javascript:_e({}, 'cvml', > '[email protected]');>> > An: [email protected] <javascript:_e({}, 'cvml', > '[email protected]');>, > Kopie: [email protected] <javascript:_e({}, 'cvml', > '[email protected]');> > Datum: 25.06.2013 17:39 > Betreff: Re: [ceph-users] Replication between 2 datacenter > ------------------------------ > > > > On Tue, 25 Jun 2013, [email protected] <javascript:_e({}, 'cvml', > '[email protected]');> wrote: > > hi folks, > > > > i have a question concerning data replication using the crushmap. > > > > Is it possible to write a crushmap to achive a 2 times 2 replcation in > the > > way a have a pool replication in one data center and an overall > replication > > of this in the backup datacenter? > > Do you mean 2 replicas in datacenter A, and 2 more replicas in datacenter > B? > > Short answer: yes, but replication is synchronous, so it will generally > only work well if the latency is low between the two sites. > > sage > > >
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