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Say I have 3.1Ghz i3 CPU on Ubuntu server. Can it be bottleneck in GB network reaching around 80-100MB/s throughput if Sata3 HDD has average/roughly 100MB/s r/w rate? Considering all cablings has max capabilities (cat6).

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What research/steps have you taken to try to answer your own question? –  wizlog Feb 3 '12 at 3:21
    
Don't really have enough information. If you're transferring a lot of files from the Ubuntu server then it is most likely going to be the gigabit lan that is slowing you down. This CPU should not be the bottleneck. Only way it would be a bottleneck is if you're doing something processor intensive like queries in a database on the server. –  kobaltz Feb 3 '12 at 3:23
    
wizlog: google! –  Pablo Feb 3 '12 at 3:24
    
kobaltz: no other work on CPU, solely transferring files over the network, similar to NAS. –  Pablo Feb 3 '12 at 3:26
    
You could have a virus scanner that is trying to scan while copying. That could cause slower than normal speeds. Also, you have to remember that transferring files over a lan is similar to transferring over USB. Those numbers are burst rates and not necessarily sustained. –  kobaltz Feb 3 '12 at 3:30

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