On 03/05/2019 17:45, Robert Sander wrote:
Hi, I would be glad if anybody could give me a tip for an erasure code profile and an associated crush ruleset. The cluster spans 2 rooms with each room containing 6 hosts and each host has 12 to 16 OSDs. The failure domain would be the room level, i.e. data should survive if one of the rooms has a power loss. Is that even possible with erasure coding? I am only coming up with profiles where m=6, but that seems to be a little overkill. Regards _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
i think if you have k=m it should work: k=2,m=2 k=3,m=3 ..etc for k=3 m=3 the rule could be something like: type erasure min_size 6 max_size 6 step set_chooseleaf_tries 5 step set_choose_tries 100 step take default step choose indep 2 type room step chooseleaf indep 3 type host step emit /Maged _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
