I have only 366M meta data stored in an ssd pool, with 16TB (10 million objects) of filesystem data (hdd pools). The active mds is using 13GB memory. Some stats of the active mds server [@c01 ~]# ceph daemonperf mds.a ---------------mds---------------- --mds_cache--- ------mds_log------ -mds_mem- ----mds_server----- mds_ -----objecter------ purg req rlat fwd inos caps exi imi |stry recy recd|subm evts segs repl|ino dn |hcr hcs hsr cre |sess|actv rd wr rdwr|purg| 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 0 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 0 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 0 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 0 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 3 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 6 85k 129 0 |2.3M 3.6M| 0 5 0 0 | 16 | 0 0 6 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 2 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 0 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 0 85k 129 0 |2.3M 3.6M| 0 1 0 0 | 16 | 0 0 0 0 | 0 0 0 0 3.6M 72k 0 0 | 28k 0 0 | 3 85k 129 0 |2.3M 3.6M| 0 1 0 0 | 16 | 0 0 0 0 | 0 -----Original Message----- From: Manuel Sopena Ballesteros [mailto:manuel.sb@xxxxxxxxxxxxx] Sent: donderdag 2 mei 2019 2:46 To: ceph-users@xxxxxxxxxxxxxx Subject: hardware requirements for metadata server Dear Ceph users, I would like to ask, does the metadata server needs much block devices for storage? Or does it only needs RAM? How could I calculate the amount of disks and/or memory needed? Thank you very much NOTICE Please consider the environment before printing this email. This message and any attachments are intended for the addressee named and may contain legally privileged/confidential/copyright information. If you are not the intended recipient, you should not read, use, disclose, copy or distribute this communication. If you have received this message in error please notify us at once by return email and then delete both messages. We accept no liability for the distribution of viruses or similar in electronic communications. This notice should not be removed. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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