pool nearfull, 300GB rbd image occupies 11TB!

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Hi folks,
my cluster shows strange behavior, the only ssd pool on cluster with repsize 3 and pg/pgp size 512 
which contains 300GB rbd image and only one snapshot occupies 11TB space!

I have tried objectmap check / rebuild, fstrim etc. which couldn’t solve that problem, any help would be appreciated.


ceph version 14.2.7 nautilus (stable)


ceph df
-------
RAW STORAGE:
  CLASS     SIZE        AVAIL      USED       RAW USED     %RAW USED
  hdd       107 TiB     68 TiB     39 TiB       39 TiB         36.45
  ssd        21 TiB     11 TiB     11 TiB       11 TiB         50.78
  TOTAL     128 TiB     78 TiB     50 TiB       50 TiB         38.84

POOLS:
  POOL                               ID     STORED      OBJECTS     USED        %USED     MAX AVAIL
  ssdshop                            83     3.5 TiB     517.72k      11 TiB     96.70       124 GiB


rados df
-------- 
POOL_NAME                         USED OBJECTS CLONES  COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED     RD_OPS      RD      WR_OPS      WR USED COMPR UNDER COMPR
ssdshop                         11 TiB  537040  28316 1611120                  0       0        0   11482773  15 GiB    44189589 854 GiB        0 B         0 B



rbd du -p ssdshop 
-----------------
NAME                                        PROVISIONED USED
shp-de-300gb.rbd@snap_2020-12-12_20:30:00    300 GiB 289 GiB
shp-de-300gb.rbd                             300 GiB 109 GiB
<TOTAL>                                      300 GiB 398 GiB


crush_rule
-----------
rule ssd {
      id 3
      type replicated
      min_size 1
      max_size 10
      step take dc1 class ssd
      step chooseleaf firstn 2 type rack
      step emit
      step take dc2 class ssd
      step chooseleaf firstn -1 type rack
      step emit
}

BR
Max
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