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:[email protected]]
Sent: donderdag 2 mei 2019 2:46
To: [email protected]
Subject: [ceph-users] 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
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