Quoting Dan van der Ster (d...@vanderster.com):
> Thanks Stefan. But isn't there also some vgremove or lvremove magic
> that needs to bring down these /dev/dm-... devices I have?

Ah, you want to clean up properly before that. Sure:

lvremove -f <volume_group>/<logical_volume>
vgremove <volume_group>
pvremove /dev/ceph-device (should wipe labels)

So ideally there should be a ceph-volume lvm destroy / zap option that
takes care of this:

1) Properly remove LV/VG/PV as shown above
2) wipefs to get rid of LVM signatures
3) dd zeroes to get rid of signatures that might still be there

Gr. Stefan

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