I am seeing 85MB/s as a speed of a single Hitachi 1TB HD.
How high can you go by mirroring or striping 2, 3, 4 harddrives?

mirroring - the same, just with 2 processes reading both can get the bandwidth. make sure you use -s high enough (like 1048576) doing gmirror label

stripping - the same, or 2,3,4 times, depends how you configure.
for highest transfer and lowest concurrency (you mostly read huge files with one process) - use small stripe size. for lowest transfer (=1 disk) and highest concurency - use very huge stripe size like 512MB, so simply different process reading different things can hit different drives, but each I/O isn't spread.

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