[ceph-users] slow replication of large buckets

Hi Cephers, We have two octopus 15.2.17 clusters in a multisite configuration. Every once in a while we have to perform a bucket reshard (most recently on 613 shards) and this practically kills our replication for a few days. Does anyone know of any priority mechanics within sync to give priority to other buckets and/or lower them? Are there any improvements to this in higher versions of ceph that we could take advantage of if we upgrade the cluster (I haven't found any)? How to safely perform the increase of rgw_data_log_num_shards, because the documentation only says: "The values of rgw_data_log_num_shards and rgw_md_log_max_shards should not be changed after sync has started." Does this mean that I should block access to the cluster, wait until sync is caught up with source/master, change this value, restart rgw and unblock access? Kind Regards, Tom