[ceph-users] check bucket index on large bucket leads to laggy index PGs

Hi, I have a bucket that got >20m index entries but only got 11 shards. When I try to run a radosgw-admin bucket check the PGs that hold the index start to become laggy after a couple of seconds. I need to stop it because it kills the whole object storage. This is a latest reef cluster and the master of a multisite which only replicates the metadata (1 realm, multiple zonegroups, one zone per zonegroup). Any ideas what I can do? I fear to reshard the bucket, because I am not sure if I can stop the resharding if the PGs become laggy. Cheers Boris