Hello, The story goes like this. I have added another 3 drives to the caching layer. OSDs were added to crush map one by one after each successful rebalance. When I added the last OSD and went away for about an hour I noticed that it's still not finished rebalancing. Further investigation showed me that it one of the older cache SSD was restarting like crazy before full boot. So I shut it down and waited for a rebalance without that OSD. Less than an hour later I had another 2 OSD restarting like crazy. I tried running scrubs on the PG's logs asked me to, but that did not help. I'm currently stuck with " 8 scrub errors" and a complete dead cluster. log_channel(cluster) log [WRN] : pg 15.8d has invalid (post-split) stats; must scrub before tier agent can activate I need help with OSD from crashing. Crash log: 0> 2016-11-23 06:41:43.365602 7f935b4eb700 -1 osd/ReplicatedPG.cc: In function 'void ReplicatedPG::hit_set_trim(ReplicatedPG::RepGather*, unsigned int)' thread 7f935b4eb700 time 2016-11-23 06:41:43.363067 osd/ReplicatedPG.cc: 10521: FAILED assert(obc) ceph version 0.94.9 (fe6d859066244b97b24f09d46552afc2071e6f90) 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x85) [0xbde2c5] 2: (ReplicatedPG::hit_set_trim(ReplicatedPG::RepGather*, unsigned int)+0x75f) [0x87e89f] 3: (ReplicatedPG::hit_set_persist()+0xedb) [0x87f8bb] 4: (ReplicatedPG::do_op(std::tr1::shared_ptr<OpRequest>&)+0xe3a) [0x8a11aa] 5: (ReplicatedPG::do_request(std::tr1::shared_ptr<OpRequest>&, ThreadPool::TPHandle&)+0x68a) [0x83c37a] 6: (OSD::dequeue_op(boost::intrusive_ptr<PG>, std::tr1::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x405) [0x69af05] 7: (OSD::ShardedOpWQ::_process(unsigned int, ceph::heartbeat_handle_d*)+0x333) [0x69b473] 8: (ShardedThreadPool::shardedthreadpool_worker(unsigned int)+0x86f) [0xbcd9cf] 9: (ShardedThreadPool::WorkThreadSharded::entry()+0x10) [0xbcfb00] 10: (()+0x7dc5) [0x7f93b9df4dc5] 11: (clone()+0x6d) [0x7f93b88d5ced] NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this. I have tried looking with full debug enabled, but those logs didn't help me much. I have tried to evict the cache layer, but some objects are stuck and can't be removed. Any suggestions would be greatly appreciated. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com