Very slow backfilling

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Hi,

I have many 'not {deep-}scrubbed in time' and a1 PG remapped+backfilling
and I don't understand why this backfilling is taking so long.

root@hbgt-ceph1-mon3:/# ceph -s
  cluster:
    id:     c300532c-51fa-11ec-9a41-0050569c3b55
    health: HEALTH_WARN
            15 pgs not deep-scrubbed in time
            13 pgs not scrubbed in time

  services:
    mon: 3 daemons, quorum hbgt-ceph1-mon1,hbgt-ceph1-mon2,hbgt-ceph1-mon3
(age 36h)
    mgr: hbgt-ceph1-mon2.nteihj(active, since 2d), standbys:
hbgt-ceph1-mon1.thrnnu, hbgt-ceph1-mon3.gmfzqm
    osd: 60 osds: 60 up (since 13h), 60 in (since 13h); 1 remapped pgs
    rgw: 3 daemons active (3 hosts, 2 zones)

  data:
    pools:   13 pools, 289 pgs
    objects: 67.74M objects, 127 TiB
    usage:   272 TiB used, 769 TiB / 1.0 PiB avail
    pgs:     288 active+clean
             1   active+remapped+backfilling

  io:
    client:   3.3 KiB/s rd, 1.5 MiB/s wr, 3 op/s rd, 8 op/s wr
    recovery: 790 KiB/s, 0 objects/s


What can I do to understand this slow recovery (is it the backfill action ?)

Thanks you

'Jof
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