Hi, As far as I know Ceph won't attempt to do any weight modifications. If you use the default CRUSH map, every devices get a default weight of 1. However this value can be modified while the cluster runs. Simply update the CRUSH map like so:
# ceph osd crush reweight {name} {weight} If you need more input, have a look at the documentation ;-) http://ceph.com/docs/master/rados/operations/crush-map/?highlight=crush#adjust-an-osd-s-crush-weight Cheers, -- Regards, Sébastien Han. On Wed, Feb 13, 2013 at 4:23 PM, sheng qiu <herbert1984...@gmail.com> wrote: > Hi Gregory, > > once running ceph online, will ceph change the weight dynamically (if > not set properly) or it can only be changed by the user through > command line or it cannot be changed online? > > Thanks, > Sheng > > On Mon, Feb 11, 2013 at 3:31 PM, Gregory Farnum <g...@inktank.com> wrote: >> On Mon, Feb 11, 2013 at 12:43 PM, Holcombe, Christopher >> <cholc...@cscinfo.com> wrote: >>> Hi Everyone, >>> >>> I just wanted to confirm my thoughts on the ceph osd weightings. My >>> understanding is they are a statistical distribution number. My current >>> setup has 3TB hard drives and they all have the default weight of 1. I was >>> thinking that if I mixed in 4TB hard drives in the future it would only put >>> 3TB of data on them. I thought if I changed the weight to 3 for the 3TB >>> hard drives and 4 for the 4TB hard drives it would correctly use the larger >>> storage disks. Is that correct? >> >> Yep, looks good. >> -Greg >> PS: This is a good question for the new ceph-users list. >> (http://ceph.com/community/introducing-ceph-users/) >> :) >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Sheng Qiu > Texas A & M University > Room 332B Wisenbaker > email: herbert1984...@gmail.com > College Station, TX 77843-3259 > _______________________________________________ > ceph-users mailing list > ceph-us...@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html