On Thu, Mar 3, 2016 at 3:15 AM, Sage Weil <sage@xxxxxxxxxxxx> wrote: > Latest branch: > > https://github.com/liewegas/ceph/commits/wip-reweight > > I made several changes: > > - new command, 'osd utilization' > > avg 51 > stddev 0.707107 (expected baseline 6.68019) Sage, sorry for bringing this up again. I don't quite understand what the "expected baseline" is for. per the code, float edev = sqrt(avg_pg * (1.0 - (1.0 / (double)num_up_in))); so it sounds sound sort of std dev, but the unit of std dev here is the "number of pg", while edev's unit is num_pg^{1/2}, so it's not comparable with avg_pg or the {base,new}_stddev. so could you shed some light on how we shall use this number as a reference? and what's the meaning of this number? thanks. > min osd.3 with 52 pgs (1.01961 * mean) > max osd.3 with 50 pgs (0.980392 * mean) > > (json version too) > > - new commands: osd test-reweight-by-{pg,utilization} > > same as osd reweight-by-*, but it doesn't actually to it--just shows the > before and after stats: > > no change > moved 2 / 408 (0.490196%) > avg 51 > stddev 5.26783 -> 4.74342 (expected baseline 6.68019) > min osd.3 with 59 -> 57 pgs (1.15686 -> 1.11765 * mean) > max osd.3 with 41 -> 42 pgs (0.803922 -> 0.823529 * mean) > > oload 105 > max_change 0.05 > average 51.000000 > overload 53.550000 > osd.3 weight 1.000000 -> 0.950012 > osd.2 weight 1.000000 -> 0.950012 > > -- Regards Kefu Chai -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
