Steve Peterson wrote:
I guess the fundamental question is this -- if I have a 4 disk
subsystem that supports an aggregate ~100MB/sec transfer raw to the
underlying disks, is it reasonable to expect a ~5MB/sec transfer rate
for a RAID5 hosted on that subsystem -- a 95% overhead.
Absolutely not, when I was investigating RAID5 performance the quickest
option I found was linux's software RAID which gave performance of
270MB/s iirc across 5 * 400Gb Disks on a Highpoint 1820a.
While doing this I gave givnum a quick test and saw similar results
as you so gave up with it as I didnt have time to investigate further.
Steve
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