ceph tell 'osd.*' config get osd_recovery_max_single_start 
ceph tell 'osd.*' config get osd_max_backfills 
ceph tell 'osd.*' config get osd_recovery_max_active 
ceph tell 'osd.*' config get osd_recovery_max_single_start 
ceph tell 'osd.*' config get osd_backfill_scan_max 
ceph tell 'osd.*' config get osd_backfill_scan_min 
ceph tell 'osd.*' config get osd_recovery_sleep_hdd

This will change the values on the running instances, without having to restart the OSD daemon:

ceph tell 'osd.*' config set osd_recovery_max_single_start 1000
ceph tell 'osd.*' config set osd_max_backfills 100
ceph tell 'osd.*' config set osd_recovery_max_active 300
ceph tell 'osd.*' config set osd_recovery_max_single_start 1000
ceph tell 'osd.*' config set osd_backfill_scan_max 51200
ceph tell 'osd.*' config set osd_backfill_scan_min 6400
ceph tell 'osd.*' config set osd_recovery_sleep_hdd 0

And add the options to the ceph.conf file under [osd] section (see Modifying ceph.conf):

osd recovery max single start = 1000
osd max backfills = 100
osd recovery max active = 300
osd recovery max single start = 1000
osd backfill scan max = 51200
osd backfill scan min = 6400
osd recovery sleep hdd = 0

From osm-001 (with environment variables initialized):

for i in ${OSDSERVERS} ; do echo "###### ${i}" ;  ssh ${i} "sudo systemctl restart ceph-osd.target" ; sleep 5; done