[Bug 1624591] Re: ceph charms should use the CFQ IO scheduler so scrubbing can be de-prioritized

[Edward Hope-Morley]

@chris.macnaughton you currently have this bug set as In Progress for
the charms but since you are investigating for the ceph packages first I
suggest you mark the bug accordingly so that we can track the work
properly.

** Also affects: ceph (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ceph-osd (Juju Charms Collection)
       Status: In Progress => Triaged

** Changed in: ceph (Juju Charms Collection)
       Status: In Progress => Triaged

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Title:
  ceph charms should use the CFQ IO scheduler so scrubbing can be de-
  prioritized

Status in ceph package in Ubuntu:
  New
Status in ceph package in Juju Charms Collection:
  Triaged
Status in ceph-osd package in Juju Charms Collection:
  Triaged

Bug description:
  Since firefly Ceph can set the IO priority and class for scrub
  traffic; this would help immensely on busy Ceph clusters.  It does
  require using the CFQ scheduler for OSDs but this should be fine since
  OSDs are (generally) the only user of that device.

  More information here: http://dachary.org/?p=3268

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