> 
> - 36 data disks, registered as mpath-devices
> - 2 NVMEs, which act as block.db for all 36 spinning disks.

That’s an unusually high ratio.  Which model exactly are the NVMe SSDs?  And 
why are you using multipathing with the HDDs?

> I hacked a workaround, which removes the last conditional check 
> (occupied_slots < fast_slots_per_device) and hard-coded the expected size of 
> each block.db in my deployment file:

Honestly that’s what I often do, especially when applying the orch service to 
systems with OSDs that were previously deployed under a different scheme. 
Hybrid OSDs can be messy.

> service_type: osd
> service_id: delta2024_osd
> service_name: osd.delta2024_osd
> placement:
>  label: delta2024
> spec:
>  block_db_size: 397G
>  data_devices:
>    rotational: 1
>    size: '15T:'
>  db_devices:
>    rotational: 0
>  encrypted: true
>  filter_logic: AND
>  objectstore: bluestore
> 
> This gives the expected results.
> In my opinion, cephadm sends a wrong „ceph-volume lvm batch“ command to the 
> osd-node. It should always include all of the disks, since running it is 
> promised to be idempotent. With the full list of disks, ceph-volume should be 
> able to calculate correct slots for block.db.
> 
> Did I find a bug here or is this expected behavior?

Good question.  Bitte enter a ticket at tracker.ceph.com 
<http://tracker.ceph.com/>.

> 
> 
> 
> ---------------------------
> M.Sc Alex Walender
> Institut für Bio- und Geowissenschaften
> IBG 5 - Computergestützte Metagenomik /
>        de.NBI Cloud Site Bielefeld
> Büro : Universität Bielefeld (UHG), N7-101
> Tel. :  +49-521-106-2907
> 
> Forschungszentrum Jülich GmbH
> 52425 Jülich
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> Eingetragen im Handelsregister des Amtsgerichts Düren Nr. HR B 3498
> Vorsitzender des Aufsichtsrats: MinDir Stefan Müller
> Geschäftsführung: Prof. Dr. Astrid Lambrecht (Vorsitzende),
> Dr. Stephanie Bauer (stellv. Vorsitzende), Prof. Dr. Ir. Pieter Jansens
> 
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