Hi,
I'd like to understand if the following behaviour is a bug.
I'm running ceph 16.2.9.
In a new OSD node with 24 hdd (16 TB each) and 2 ssd (1.44 TB each), I'd like to have "ceph orch" allocate WAL and DB on the ssd devices.
I use the following service spec:
spec:
data_devices:
rotational: 1
size: '14T:'
db_devices:
rotational: 0
size: '1T:'
db_slots: 12
This results in each OSD having a 60GB volume for WAL/DB, which equates to 50% total usage in the VG on each ssd, and 50% free.
I honestly don't know what size to expect, but exactly 50% of capacity makes me suspect this is due to a bug:
https://tracker.ceph.com/issues/54541
(In fact, I had run into this bug when specifying block_db_size rather than db_slots)
Questions:
Am I being bit by that bug?
Is there a better approach, in general, to my situation?
Are DB sizes still governed by the rocksdb tiering? (I thought that this was mostly resolved by https://github.com/ceph/ceph/pull/29687 )
If I provision a DB/WAL logical volume size to 61GB, is that effectively a 30GB database, and 30GB of extra room for compaction?
Thanks,
Patrick
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