Usage after upgrade to Mimic

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Hello,

I'm testing in a lab test cluster all the upgrade procedures from an
old cluster (deployed originally as Jewel, now Luminous, osds are
already bluestore), but I'm stuck with a very odd observation (about
usage):

Luminous:
  data:
    objects: 27.88k objects, 109GiB
    usage:   347GiB used, 11.1TiB / 11.4TiB avail

(after upgrade to) Mimic:
      data:
        objects: 43.24 k objects, 169 GiB
        usage:   12 TiB used, 11 TiB / 22 TiB avail

Luminous:
GLOBAL: 
    SIZE        AVAIL       RAW USED     %RAW USED
    11.4TiB     11.1TiB       347GiB          2.97
POOLS:
    NAME                   ID     USED        %USED     MAX AVAIL     OBJECTS
    hdd-pool               1      48.5GiB      1.38       3.39TiB       12492
    ssd-pool               2      60.0GiB     37.59       99.7GiB       15392
    
(after upgrade to) Mimic:
GLOBAL:
    SIZE       AVAIL      RAW USED     %RAW USED
    22 TiB     11 TiB       12 TiB         51.41
POOLS:
    NAME                   ID     USED        %USED     MAX AVAIL     OBJECTS
    hdd-pool               1      108 GiB      3.26       3.1 TiB       27848
    ssd-pool               2       60 GiB     38.96        94 GiB       15394

Can someone explains those diferences? (or what I missed here)

Is something related to bluestore_min_alloc_size?

Thanks,

--
Herbert
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