I don't want to sound confrontational... 4 mb/s can be beat by a USB 1.0 external drive, single spindle. If it was a copy from local disk to SAN, I would guess the local drives you were reading from were busy doing something else at the same time.
If you re-run the test(s) you should keep an eye on the queue depth and response time of source drive and the target drive... as well as MB/s total on each. You can only write as fast as you can read in a test like that.
Better then that though, you may want to try using IOmeter for benchmarking instead.
_________________ Richard Siemers The views and opinions expressed are my own and do not necessarily reflect those of my employer.
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