Greetings, I have opened issue #16662 for a bluestore assert that happens when using SSDs with I/O sizes larger than 4 MB. Below is the traceback. Inquiring minds can look at the issue for an analysis of what is happening. If you set 'bluestore_max_alloc_size' to 4194304 in ceph.conf, then you can avoid this problem. Cheers, Kevan 0> 2016-07-12 15:37:03.377685 7f47731a7700 -1 os/bluestore/BlueStore.cc: In function 'int BlueStore::_do_alloc_write(BlueStore::TransContext*, BlueStore::WriteContext*)' thread 7f47731a7700 time 2016-07-12 15:37:03.368821 os/bluestore/BlueStore.cc: 5988: FAILED assert(r == 0) ceph version 11.0.0-196-g85bb43e (85bb43e111692989d2296a389ce45377d2297d6f) 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x85) [0x7f479212de35] 2: (BlueStore::_do_alloc_write(BlueStore::TransContext*, BlueStore::WriteContext*)+0x10af) [0x7f4791d48c4f] 3: (BlueStore::_do_write(BlueStore::TransContext*, boost::intrusive_ptr<BlueStore::Collection>&, boost::intrusive_ptr<BlueStore::Onode>, unsigned long, unsigned long, ceph::buffer::list&, unsigned int)+0x3e9) [0x7f4791d69479] 4: (BlueStore::_write(BlueStore::TransContext*, boost::intrusive_ptr<BlueStore::Collection>&, boost::intrusive_ptr<BlueStore::Onode>&, unsigned long, unsigned long, ceph::buffer::list&, unsigned int)+0x10f) [0x7f4791d6a0bf] 5: (BlueStore::_txc_add_transaction(BlueStore::TransContext*, ObjectStore::Transaction*)+0x1127) [0x7f4791d6e297] 6: (BlueStore::queue_transactions(ObjectStore::Sequencer*, std::vector<ObjectStore::Transaction, std::allocator<ObjectStore::Transaction> >&, std::shared_ptr<TrackedOp>, ThreadPool::TPHandle*)+0x41a) [0x7f4791d7017a] 7: (ReplicatedPG::queue_transactions(std::vector<ObjectStore::Transaction, std::allocator<ObjectStore::Transaction> >&, std::shared_ptr<OpRequest>)+0x8c) [0x7f4791bffc4c] 8: (ReplicatedBackend::submit_transaction(hobject_t const&, eversion_t const&, std::unique_ptr<PGBackend::PGTransaction, std::default_delete<PGBackend::PGTransaction> >&&, eversion_t const&, eversion_t const&, std::vector<pg_log_entry_t, std::allocator<pg_log_entry_t> > const&, boost::optional<pg_hit_set_history_t>&, Context*, Context*, Context*, unsigned long, osd_reqid_t, std::shared_ptr<OpRequest>)+0x94d) [0x7f4791c3b67d] 9: (ReplicatedPG::issue_repop(ReplicatedPG::RepGather*, ReplicatedPG::OpContext*)+0x6af) [0x7f4791b8ba5f] 10: (ReplicatedPG::execute_ctx(ReplicatedPG::OpContext*)+0xeea) [0x7f4791bdfeda] 11: (ReplicatedPG::do_op(std::shared_ptr<OpRequest>&)+0x2843) [0x7f4791be3853] 12: (ReplicatedPG::do_request(std::shared_ptr<OpRequest>&, ThreadPool::TPHandle&)+0x777) [0x7f4791b9e957] 13: (OSD::dequeue_op(boost::intrusive_ptr<PG>, std::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x41d) [0x7f4791a4d0ad] 14: (PGQueueable::RunVis::operator()(std::shared_ptr<OpRequest> const&)+0x6d) [0x7f4791a4d2fd] 15: (OSD::ShardedOpWQ::_process(unsigned int, ceph::heartbeat_handle_d*)+0x864) [0x7f4791a6e884] 16: (ShardedThreadPool::shardedthreadpool_worker(unsigned int)+0x947) [0x7f4792112147] 17: (ShardedThreadPool::WorkThreadSharded::entry()+0x10) [0x7f47921142a0] 18: (()+0x7dc5) [0x7f478ffd7dc5] 19: (clone()+0x6d) [0x7f478e1efced] NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html