Strange USED size

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Hello. I've searched a lot but couldn't find why the size of USED column in
the output of ceph df is a lot times bigger than the actual size. I'm using
Nautilus (14.2.8), and I've 1000 buckets with 100 objectsineach bucket.
Each object is around 10B.

ceph df
RAW STORAGE:
    CLASS     SIZE        AVAIL       USED        RAW USED     %RAW USED
    hdd       511 GiB     147 GiB     340 GiB      364 GiB         71.21
    TOTAL     511 GiB     147 GiB     340 GiB      364 GiB         71.21

POOLS:
    POOL                           ID     STORED      OBJECTS
USED        %USED     MAX AVAIL
    .rgw.root                       1     1.1 KiB           4     768
KiB         0        36 GiB
    default.rgw.control            11         0 B           8         0
B         0        36 GiB
    default.rgw.meta               12     449 KiB       2.00k     376
MiB      0.34        36 GiB
    default.rgw.log                13     3.4 KiB         207       6
MiB         0        36 GiB
    default.rgw.buckets.index      14         0 B       1.00k         0
B         0        36 GiB
    default.rgw.buckets.data       15     969 KiB        100k      18
GiB     14.52        36 GiB
    default.rgw.buckets.non-ec     16        27 B           1     192
KiB         0        36 GiB

Does anyone know what are the maths behind this, to show 18GiB used when I
have something like 1 MiB?

Thanks in advance, Marcelo.
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