Re: osd client op priority vs osd recovery op priority

Mikaël Cluseau <mcluseau@xxxxxx> · Tue, 09 Jul 2013 14:57:51 +1100

    On 09/07/2013 14:41, Gregory Farnum wrote:

      On Mon, Jul 8, 2013 at 8:08 PM, Mikaël Cluseau <mcluseau@xxxxxx> wrote:

        Hi Greg,

thank you for your (fast) answer.

      <snip>

Please keep all messages on the list. :)

    oops, reply-to isn't set by default here ^^

      I just realized you were talking about increased latencies during
scrubbing; the options you reference are for data recovery, not
scrubbing. However, there are a number of options you can tune to
throttle scrubbing in different ways; have you checked the
documentation for those? (eg,
http://ceph.com/docs/master/rados/configuration/osd-config-ref/#scrubbing)

    Thanks, having a second look while speaking with a expert seems
    valuable ;) I see two options.

      increase osd scrub max interval to extend the time
        between scrubs.
      osd scrub load threshold (default 0.5) : I'm always higher
        (between 1 and 2) so increasing this could enable the osd
          scrub min interval parameter to be usefull...

    I think I'll go for the second option because the problematic load
    spikes seem to have a period of 24h + epsilon...

    Thanks a lot !

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