does ceph consider the device performance for distributing data?

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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?

Thanks,
Sheng

-- 
Sheng Qiu
Texas A & M University
Room 332B Wisenbaker
email: herbert1984106@xxxxxxxxx
College Station, TX 77843-3259
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