Hi,
it's really as easy as it sounds (fresh test cluster on 18.2.1 without
any pools yet):
ceph:~ # ceph fs volume create cephfs
(wait a minute or two)
ceph:~ # ceph fs status
cephfs - 0 clients
======
RANK STATE MDS ACTIVITY DNS INOS
DIRS CAPS
0 active cephfs.soc9-ceph.uqcybj Reqs: 0 /s 10 13
12 0
POOL TYPE USED AVAIL
cephfs.cephfs.meta metadata 64.0k 13.8G
cephfs.cephfs.data data 0 13.8G
STANDBY MDS
cephfs.soc9-ceph.cgkvrf
MDS version: ceph version 18.2.1
(7fe91d5d5842e04be3b4f514d6dd990c54b29c76) reef (stable)
The pools and the daemons are created automatically (you can control
the placement of the daemons with the --placement option). Note that
the metadata pool needs to be on fast storage, so you might need to
change the ruleset for the metadata pool after creation in case you
have HDDs in place.
Changing pools after the creation can be done via ceph fs commands:
ceph:~ # ceph osd pool create cephfs_data2
pool 'cephfs_data2' created
ceph:~ # ceph fs add_data_pool cephfs cephfs_data2
Pool 'cephfs_data2' (id '4') has pg autoscale mode 'on' but is not
marked as bulk.
Consider setting the flag by running
# ceph osd pool set cephfs_data2 bulk true
added data pool 4 to fsmap
ceph:~ # ceph fs status
cephfs - 0 clients
======
RANK STATE MDS ACTIVITY DNS INOS
DIRS CAPS
0 active cephfs.soc9-ceph.uqcybj Reqs: 0 /s 10 13
12 0
POOL TYPE USED AVAIL
cephfs.cephfs.meta metadata 64.0k 13.8G
cephfs.cephfs.data data 0 13.8G
cephfs_data2 data 0 13.8G
You can't remove the default data pool, though (here it's
cephfs.cephfs.data). If you want to control the pool creation you can
fall back to the method you mentioned, create pools as you require
them and then create a new cephfs, and deploy the mds service.
I haven't looked too deep into changing the default pool yet, so there
might be a way to switch that as well.
Regards,
Eugen
Zitat von Albert Shih <Albert.Shih@xxxxxxxx>:
Hi everyone,
Stupid question about
ceph fs volume create
how can I specify the metadata pool and the data pool ?
I was able to create a cephfs «manually» with something like
ceph fs new vo cephfs_metadata cephfs_data
but as I understand the documentation, with this method I need to deploy
the mds, and the «new» way to do it is to use ceph fs volume.
But with ceph fs volume I didn't find any documentation of how to set the
metadata/data pool
I also didn't find any way to change after the creation of the volume the
pool.
Thanks
--
Albert SHIH 🦫 🐸
France
Heure locale/Local time:
mer. 24 janv. 2024 19:24:23 CET
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