can't Create Ceph OSD: no disk unused. how to fix it

To fix it just install more disks ;-)

Only "officially" empty disks are listed here. Obviously for security.

If you want to re-use a previously used disk: go to <node> - Disks, select your device an click "Wipe Disk" at the top.

TRIPPLE check to select the right one - this can not be undone!

Best regards
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