Hello, Olivier!
Try to check recent ML thread titled "Changing replica size of a running pool". David Turner described the ways to utilize 2 nodes cluster with some kind of redundancy.
Best regards,
Vladimir
2017-05-06 16:55 GMT+05:00 Olivier Roch <olivierrochvilato@xxxxxxxxx>:
Hi all,I have a 3 nodes CEPH cluster, each node with 4 OSD and 1 monitor and replication across hosts defined in the crushmap. 2 pools (1 size=3, min-size=2 , 1 size=2 min-size 2)One of the nodes failed (hardware failure) so I removed it from the crush map and change replication from host to osd.After reconstruction cluster health is ok now (with a warning for the monitor down)While I managed to restore the 3rd node is there a way to cover a 2nd node failure, leaving just 1 node in the cluster (disk space used does not exceed 1 node capacity).I assume i will have to set up an external monitor, but what else ?Olivier
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