Hi, After upgrading our cluster to 17.2.6 all OSDs appear to have "osd_op_queue": "mclock_scheduler" (used to be wpq). As we see several OSDs reporting unjustifiable heavy load, we would like to revert this back to "wpq" but any attempt yells the following error: root@store14:~# ceph tell osd.71 config set osd_op_queue wpq Error EPERM: error setting 'osd_op_queue' to 'wpq': (1) Operation not permitted I cannot find anywhere why this is happening, I am guessing another setting needs to be changed as well. Has anybody resolved this? Best, Nick The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th' ann an Oilthigh Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336.