UPDATE docs.clyso.com/blog/ceph-volume-ceph-osd-migrate-db-to-larger-ssd-flash-device/
ceph-volume is a proper way of doing db migration. It uses ceph-bluestore-tool for the actual data movement and some other low-level stuff but LVM metadata updates are performed exclusivly by ceph-volume.
[1] https://docs.ceph.com/en/latest/ceph-volume/lvm/migrate/