On Mon, 10 Sep 2012, sheng qiu wrote: > HI, > > i have a simple question. > for distribution workload among OSDs, does ceph do any online modeling > for OSDs, i.e. collect the online IO latency and try to distribute > more workloads to lower latency OSDs? or only based on > capacity/utilization balance?
Nope. It would be nice if it did, but there are a limit number of things we can do in those cases to direct traffic accordingly without moving data around, which is expensive... and the data temperature that is driving the imbalance may be temporary/transient. sage > > Thanks, > Sheng > > -- > Sheng Qiu > Texas A & M University > Room 332B Wisenbaker > email: [email protected] > College Station, TX 77843-3259 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to [email protected] > 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
