Hi Guillaume, your commit 4941d09 https://github.com/ceph/ceph/commit/4941d098e337f2b7ad8c6f7c90be3ae252d22f7b introduces this bug. Please have a look at https://tracker.ceph.com/issues/72696 Especially the changes to src/ceph-volume/ceph_volume/util/device.py were causing this. After I reverted them I get the expected behaviour. Am 07.08.25 um 4:18 PM schrieb Robert Sander:
we have OSD nodes currently consisting of two 605GB SSDs and six 18TB HDDs. The hosts have room for twelve HDDs.
We created a drivegroup spec that looks like this:
spec: block_db_size: 100GB data_devices: rotational: true size: '18TB:' db_devices: rotational: false size: '550GB:650GB' db_slots: 6
Initially this creates 6 OSDs with their RocksDB+WAL on the SSDs, 3 each which is nice for load balancing.
But when we add another HDD it gets a 17.9TB data volume and a 100GB DB volume, both on the HDD:
sdm 8:192 0 18T 0 disk ├─ceph--846e1a59--aff6--4ef8--9b71--de7241531677-osd-- block--026e8cef--123d--47d9--9b30--211f94edf96c 252:16 0 17.9T 0 lvm └─ceph--846e1a59--aff6--4ef8--9b71--de7241531677-osd--db--88c47d0b-- f5c6--4cec--8909--c5f8036ca459 252:17 0 100G 0 lvm
I would have assumed that the remaining 305GB on the SSDs would be used.
Regards -- Robert Sander Linux Consultant Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: +49 30 405051 - 0 Fax: +49 30 405051 - 19 Amtsgericht Berlin-Charlottenburg - HRB 220009 B Geschäftsführer: Peer Heinlein - Sitz: Berlin