Ceph can mirror data between clusters (http://docs.ceph.com/docs/master/rbd/rbd-mirroring/), but can it mirror data between pools in the same cluster? My use case is DR in the even of a room failure. I have a single CEPH cluster that spans multiple rooms. The two rooms have separate power and cooling, but have a single 10Gbe link between them (actually 2 w/ active-passive failover). I can configure pools and crushmaps to keep data local to each room so my single link doesn't become a bottleneck. However, I'd like to be able to recovery quickly if a room UPS fails. Ideally I'd like something like this: HA pool - spans rooms but we limit how much we put on it to avoid latency or saturation issues with our single 10Gbe link. room1 pool - Writes only to OSDs in room 1 room2 pool - Writes only to OSDs in room 2 room1-backup pool - Asynchronous mirror of room1 pool that writes only to OSDs in room 2 room2-backup pool - Asynchronous mirror of room2 pool that writes only to OSDs in room 1 In the event of a room failure, my very important stuff migrates or reboots immediately in the other room without any manual steps. For everything else, I manually spin up new VMs (scripted, of course) that run from the mirrored backups. Is this possible? If I made it two separate CEPH clusters, how would I do the automated HA failover? I could have 3 clusters (HA, room1, room2, mirroring between room1 and roomt2), but then each cluster would be so small (2 nodes, 3 nodes) that node failure becomes more of a risk than room failure. (And yes, I do have a 3rd small room with monitors running so if one of the primary rooms goes down monitors in the remaining room + 3rd room have a quorum) Thanks -- Adam Carheden _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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