Error EPERM: error setting 'osd_op_queue' to 'wpq': (1) Operation not permitted

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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?

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