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How to analyse performance ESXi NFS Copy between datastores

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http://serverfault.com – I'm having trouble with ESXi backup/restore performance. My setup: VMWare ESXi 5.0.0 on a HP ProLiant DL 360 G6, runnnig RAID 5 on a P410 SmartArray as SAS QNAP Nas (QNAP TS-809U-RP NAS 8 bays 4USB) Connected over Gigabit I try to copy a 200 GB file from the NAS to the Datastore. Currently, it will take 10 hours, so the speed is about 5 MB/s. This is very slow and I'm currently trying to figure out why it is this slow. I ran esxtop on my ESXi machine, it shows mainly an idle process, I ran the QNAP system resource monitor, it shows bandwith usage of +- 10 MB/s, no real CPU usage.. (HowTos)