On Fri, Aug 31, 2012 at 9:24 AM, Andrew Thompson <andrewkt@xxxxxxxxxxx> wrote: > On 8/31/2012 12:10 PM, Sage Weil wrote: >> >> On Fri, 31 Aug 2012, Andrew Thompson wrote: >>> >>> Have you been reweight-ing osds? I went round and round with my cluster a >>> few days ago reloading different crush maps only to find that it >>> re-injecting a crush map didn't seem to overwrite reweights. Take a look at >>> `ceph osd tree` to see if the reweight column matches the weight column. >> >> Note that the ideal situation is for reweight to be 1, regardless of what >> the crush weight is. If you find the utilizations are skewed, I would >> look for other causes before resorting to reweight-by-utilization; it is >> meant to adjust the normal statistical variation you expect from a >> (pseudo)random placement, but if the variance is high there is likely >> another cause. > > > So if someone(me, guilty) had been messing with reweight, will setting them > all to 1 return it to a normal un-reweight-ed state? Yep! If you have OSDs with different sizes you'll want to adjust the CRUSH weights, not the reweight values: http://ceph.com/docs/master/ops/manage/crush/#adjusting-the-crush-weight -- 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
