Hi,
apparently, db_slots is still not implemented. I just tried it on a
test cluster with 18.2.2:
# ceph orch apply -i osd-slots.yaml --dry-run
Error EINVAL: Failed to validate OSD spec "osd-hdd-ssd.db_devices":
Filtering for `db_slots` is not supported
If it was, I would be interested as well if it could be used in
combination with block_db_size to not consume the entire disk. We
haven't had too wild configuration requirements yet, I usually stick
to block_db_size (without limit) if there's a requirement to not use
the entire db disk. Because as you already stated, in that case the
orchestrator creates one db device per HDD with the specified db size,
leaving space on the db device.
Maybe that's one of the reasons that db_slots still hasn't been implemented?
Regards,
Eugen
Zitat von Robert Sander <[email protected]>:
Hi,
what is the purpose of the db_slots attribute in a DriveGroup specification?
My interpretation of the documentation is that I can define how many
OSDs use one db device.
https://docs.ceph.com/en/reef/cephadm/services/osd/#additional-options
"db_slots - How many OSDs per DB device"
The default for the cephadm orchestrator is to create as many DB
volumes on a DB device as needed for the number of OSDs.
In a scenario where there are empty slots for HDDs and an existing
DB device should not be used fully "db_slots" could be used.
But even if db_slots is in an OSD service spec the orchestrator will
only create as many DB volumes as there are HDDs currently available.
There is a discussion from 2021 where the use of "block_db_size" and
"limit" is suggested:
https://lists.ceph.io/hyperkitty/list/[email protected]/thread/6EVOYOHS3BTTNLKBRGLPTZ76HPNLP6FC/#6EVOYOHS3BTTNLKBRGLPTZ76HPNLP6FC
Shouldn't db_slots make that easier?
Is this a bug in the orchestrator?
Regards
--
Robert Sander
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin
http://www.heinlein-support.de
Tel: 030 / 405051-43
Fax: 030 / 405051-19
Zwangsangaben lt. §35a GmbHG:
HRB 220009 B / Amtsgericht Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein -- Sitz: Berlin
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