Ghost usage on pool and unable to reclaim free space.

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Hello

Running ceph v14.2.8 on everything. Pool is using replicated_rule with
size/min_size 2 with 2 OSD's. I have scrubbed and deep scrubbed the OSDs.

This pool was attached as data pool to cephfs containing alot of small
files. I have since removed all files and detached the pool from the fs.
Somehow the pool is still using 90GB.

POOLS:
   POOL                ID     STORED      OBJECTS     USED        %USED
    MAX AVAIL     QUOTA OBJECTS     QUOTA BYTES     DIRTY       USED COMPR
    UNDER COMPR
   fast                54      90 GiB       5.25M      90 GiB      2.93
      1.4 TiB     N/A               N/A               5.25M            0 B
            0 B

# rados -p fast ls|wc -l
1312030

# rados -p fast stat 100073acce3.00000000
error stat-ing fast/100073acce3.00000000: (2) No such file or directory

# rados -p fast rm 100073acce3.00000000
error removing fast>100073acce3.00000000: (2) No such file or directory

# rados -p fast get 100073acce3.00000000 test
error getting fast/100073acce3.00000000: (2) No such file or directory

I get the same error for every single object in the pool

# rados purge fast --yes-i-really-really-mean-it
Warning: using slow linear search
Removed 2625749 objects
successfully purged pool fast

There was 5.25M objects in the pool before and after running this command.
No change in ceph df.

Any ideas how to reclaim the free space ? I can remove & recreate the pool,
but i would like to know why and how to deal with this situation when i
don't have that privilege

Best regards
Kári Bertilsson
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