On Mon, Jul 8, 2013 at 6:13 PM, Mikaël Cluseau <mcluseau@xxxxxx> wrote: > Hi dear list :) > > I have a small doubt about these two options, as the documentation states > this : > > osd client op priority > > Description: The priority set for client operations. It is relative to > osd recovery op priority. > Default: 63 > > osd recovery op priority > > Description: The priority set for recovery operations. It is relative to > osd client op priority. > Default: 10 > > > > I wonder if the number in question is a priority like in "nice" (the lowest > number has the highest priority) or more like a weight (the highest number > has the highest priority). > > I think it is a "nice"-like approach, since scrubbing tends to kill my > cluster's clients performance (thus, I should swap the defaults to keep a > good client performance), but I'd like to be sure before making things worse > :) Nope, the priorities are a weight and higher numbers will let more of the dispatch messages through. What kinds of performance drops are you seeing during recovery? If for instance you've got clients sendings lots of operations that are small compared to object size then the bounding won't work out quite right, or maybe you're just knocking out a bunch of servers and getting bad long-tail latency effects. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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