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Can be achieved by looking at the folder (The hard way):
/var/lib/ceph/osd/ceph-# or when using custom cluster name /var/lib/ceph/osd/clustername-number

Or the easy way:
ceph osd metadata $ID | grep -e id -e hostname -e osd_objectstore OR
ceph osd count-metadata osd_objectstore OR
see:

• http://docs.ceph.com/docs/mimic/man/8/ceph/
• https://ceph.com/geen-categorie/ceph-osd-where-is-my-data/
• https://www.virtualtothecore.com/how-to-migrate-ceph-storage-volumes-from-filestore-to-bluestore/

When deploying a hyperconverged solution and using the is_hci flag, (set to true or false), we can validate the osd memory allocation that is calculated and stored in ceph.conf from the machine's total memory.