What is osd-lockbox? How does it work?

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[@-]# ceph-disk prepare --bluestore --zap-disk --dmcrypt /dev/sdg

Creates these 3 why?

drwxr-x--- 14 ceph ceph  200 May 31 19:14 ..
drwxr-xr-x  3 root root 1024 May 31 22:24 
93bce5fa-3443-4bb2-bb93-bf65ad40ebcd
lrwxrwxrwx  1 root root   62 May 31 22:24 
d29c5890-9b02-46da-b7b1-24fcb04793df -> 
/var/lib/ceph/osd-lockbox/93bce5fa-3443-4bb2-bb93-bf65ad40ebcd
lrwxrwxrwx  1 root root   62 May 31 22:24 
20fe293d-3223-4c9b-adf6-b31a94c05e53 -> 
/var/lib/ceph/osd-lockbox/93bce5fa-3443-4bb2-bb93-bf65ad40ebcd
lrwxrwxrwx  1 root root   62 May 31 22:24 
dd00fba7-4528-4f78-a0d4-ee32a2bbae28 -> 
/var/lib/ceph/osd-lockbox/93bce5fa-3443-4bb2-bb93-bf65ad40ebcd
drwxr-xr-x  3 root root  182 May 31 22:24 .

Why is there only one partition?
Number  Start (sector)    End (sector)  Size       Code  Name
   5            2048           22527   10.0 MiB    FFFF  ceph lockbox

While a 'normal' osd has 
Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          206847   100.0 MiB   FFFF  ceph data
   2          206848      5860533134   2.7 TiB     FFFF  ceph block

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