Ceph journal in case of filestore is providing transactional writes, so, you can't remove journal. Thanks & Regards Somnath -----Original Message----- From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Casier David Sent: Sunday, May 24, 2015 4:22 AM To: ceph-devel@xxxxxxxxxxxxxxx Subject: Perfomance CPU and IOPS Hello everybody, I have some suggestions to improve the Ceph performance with in case of using Rados Block Device. On FileStore : - Remove all metadata in HDD and used omap on SSD. This reduce IOPS and increases throughput. - Remove journal, thread "sync_entry", and write directly in queue_transaction. To compensate journal, you could use Cache Tier Ceph. ceph-osd must be with less Thread and Lock. With 1 OSD for 1 HDD, i think Lock is necessary only for scrub, recovery or other background job. And only one thread with the use of libaio. I think Ceph-OSD should be very light. Potentially with direct writing aftergiven the transmitted data to other OSD from map. In this case, a lot of ceph-osd could work on the same server. Actually, i work on the repository https://www.github.com/dcasier/ceph. You could see start works on FileStore.* But potentially not safe. David. -- 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 ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies). ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
