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Once PR#23230 has been merged, we have an API to modify individual cluster settings. One idea how to utilize this is to provide a simple UI for modifying the priority/performance of cluster rebuild operations in order to minimize the impact on serving client workloads versus speeding up the rebuild process.

Currently, a cluster's rebuild performance can be influenced on the CLI as follows:

1) Slow down recovery:

ceph tell osd.* injectargs '--osd_max_backfills 1';
ceph tell osd.* injectargs '--osd_recovery_max_active 1';
ceph tell osd.* injectargs '--osd_recovery_max_single_start 1';
ceph tell osd.* injectargs '--osd_recovery_sleep 0.5;

2) Restore default values:

ceph tell osd.* injectargs '--osd_max_backfills 1';
ceph tell osd.* injectargs '--osd_recovery_max_active 3';
ceph tell osd.* injectargs '--osd_recovery_max_single_start 1';
ceph tell osd.* injectargs '--osd_recovery_sleep 0;

3) Accelerate recovery:

ceph tell osd.* injectargs '--osd_max_backfills 4';
ceph tell osd.* injectargs '--osd_recovery_max_active 4';
ceph tell osd.* injectargs '--osd_recovery_max_single_start 4';
ceph tell osd.* injectargs '--osd_recovery_sleep 0;

It would be nice to have a simple way of switching between these three modes (Recovery speed: Slow/Default/Fast) with a single selection box (with the option of changing the individual parameters behind each setting maybe?)