On 2020-09-09 15:51, Eugen Block wrote: > Hi Simon, > >> What about the idea of creating the cluster over two data centers? >> Would it be possible to modify the crush map, so one pool gets >> replicated over those two data centers and if one fails, the other one >> would still be functional? > > A stretched cluster is a valid approach, but you have to consider > several things like MON quorum (you'll need a third MON independent of > the two DCs) and failure domains and resiliency. The crush map and rules > can be easily adjusted to reflect two DCs. There is a PR open to _explicitly_ support stretch clusters in Ceph [1]. To get it explained you can watch this presentation Gregory Farnum gave at FOSDEM 2020 [2]. Fortunately you can pause the video as he is going quite fast ;-). Better than two DCs are three DCs: that just works. And even better than theee are of course four DCs ... so you can recover from a complete DC failure ... Gr. Stefan [1]: https://github.com/ceph/ceph/pull/32336 [2]: https://archive.fosdem.org/2020/schedule/event/sds_ceph_stretch_clusters/ _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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