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

[James Page]

Reading: https://www.sebastien-han.fr/blog/2012/10/29/optimized-your-
ssd/

Also feels like SSD's should use noop rather than deadline or cfq.


** Changed in: ceph (Ubuntu)
       Status: Confirmed => Invalid

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

Status in OpenStack ceph charm:
  Won't Fix
Status in OpenStack ceph-osd charm:
  Triaged
Status in ceph package in Ubuntu:
  Invalid
Status in ceph package in Juju Charms Collection:
  Invalid
Status in ceph-osd package in Juju Charms Collection:
  Invalid

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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