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I'm using a rpm build directly from ceph, ceph-osd-16.2.1-0.el8.x86_64

I tweaked the configuration with a custom installation path

In the unit, there is the configuration:
ExecStartPre=/usr/libexec/ceph/ceph-osd-prestart.sh --cluster ${CLUSTER} --id %i

And this script check the osd path with an hard coded value:
data="/var/lib/ceph/osd/${cluster:-ceph}-$id"

It doesn't use the key from the configuration file, but uses the deprecated feature $cluster. But using ceph-conf would have solve the problem:

$ CEPH_CONF=/data/ceph/conf/ceph.conf --name osd.1 --show-config-value osd_data
/data/ceph/data/osd/ceph.1