On Tue, 14 May 2013, Chen, Xiaoxi wrote: > from which release can we get this? That function has been there since 0.30something I think, although we fixed some major bug sometime around argonaut. But it's largely unused and undocumented, so testing is encouraged! :) sage > > ???? iPhone > > ? 2013-5-14?8:36?"Sage Weil" <sage@xxxxxxxxxxx> ??? > > > Hi Jim- > > > > You mentioned the other day your concerns about the uniformity of the PG > > and data distribution. There are several ways to attack it (including > > increasing the number of PGs), but one that we haven't tested much yet is > > the 'reweight-by-utilization' function in the monitor. > > > > The idea is that there will always be some statistical variance in the > > distribution and a non-zero probability of having outlier OSDs with too > > many PG. We adjust for this by taking nodes that are substantially above > > the mean down by some adjustment factor in an automated way. > > > > ceph osd reweight-by-utilization MIN > > > > where MIN is the minimum relative utilization at which we will start > > adjusting down. It is always > 100 (100% of the mean), and defaults to > > 120. After it adjusts the reweights, you should see the result in 'ceph > > osd tree' output > > > > Have you played with this at all on your cluster? I'd be very interested > > in how well this does/does not improve things for you. > > > > Thanks! > > sage > > > > -- > > 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 > -- 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
