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Also be aware that due to the nature how monitors work (and that you need an unequal number of them), that if the datacenter loses power with the majority of the monitors, you can't
access your backup-data either (you can after fiddling with the monmap, but it doesn't failover).
configuration if crushmap is described very well in the documentation: => http://ceph.com/docs/master/rados/operations/crush-map/
wogri
Von: ceph-users-bounces@xxxxxxxxxxxxxx [ceph-users-bounces@xxxxxxxxxxxxxx]" im Auftrag von "Joachim.Tork@xxxxxx [Joachim.Tork@xxxxxx]
Gesendet: Donnerstag, 27. Juni 2013 07:12 Bis: ceph-users@xxxxxxxxxxxxxx Betreff: Antwort: Re: Replication between 2 datacenter 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 <sage@xxxxxxxxxxx> An: Joachim.Tork@xxxxxx, Kopie: ceph-users@xxxxxxxxxxxxxx Datum: 25.06.2013 17:39 Betreff: Re: [ceph-users] Replication between 2 datacenter On Tue, 25 Jun 2013, Joachim.Tork@xxxxxx 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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