Hi David, I think that part of the problem with unbalanced osds is that your EC rule k=7,m=2 gives 9 total chunks and you have 9 total servers. This is essentially tying cephs hands as it has no choice where to put the pg's. Assuming a failure domain of host then each EC shard needs to be on a different host. Therefore adding another host would help, but you're still going to be limited. For balance a rule of k=4,m=2 would work better on 9 servers. I had a similar experience with 6 hosts and 4,2 EC rule. This may also cause you other problems if you have a host failure as you wouldn't be able to balance out the host due to 8 hosts being less than 9 shards. You would stay degraded. At least that is my understanding. I'm happy to be corrected if I've put you wrong. Rich _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |