[CentOS] Benchmark Disk IO

From: Matt Keating <keatster at gmail.com>
>> I don't usually use iozone (I usually use bonnie++) so take this with 
>> a grain of salt, but those speed look suspiciously like cache speeds. 
>> Bump the size (-s parameter) up to twice your real RAM size.
> Will give that a try - 16gb file incoming 

Or maybe do a:
  sync; echo 3 > /proc/sys/vm/drop_caches
between the 2 tests...?

JD