about cpu usage, I think this one (but not sure, but I use tiering and disks were idle when CPU usage was high, also OSD restart didn't help (tried twice), upgrade to 0.80.1 helped, all or almost all OSDs were affected):
"osd: prevent busy loop when tiering agent can do no work (David Zafman)"
http:// ceph.com/ releases/ v0-80-1- firefly- released/
scrubing:
"osd: revert incomplete scrub fix (Samuel Just)"
about cpu usage, I think this one (but not sure, but I use tiering and disks were idle when CPU usage was high, also OSD restart didn't help (tried twice), upgrade to 0.80.1 helped, all or almost all OSDs were affected):
"osd: prevent busy loop when tiering agent can do no work (David Zafman)"