I have to disagree.  I've never seen RAID 5 increase anyone's HP 3000
system performance.  In *many* cases I've seen RAID 5 seriously hurt
performance.  In many of those cases, going back to RAID 1 or JBOD in turn
increased performance.

Bill

At 04:29 PM 12/7/99 -0800, Steve Dirickson wrote:
> > over RAID level in these arrays.  If you use RAID 5 you'll
> > pay a price in performance.
>
>Probably not. RAID5 has slightly worse write performance than a single
>spindle (due to the need to update the parity information), but
>substantially better read performance. Since reads outnumber writes by an
>order of magnitude or two (or three...) in "normal" installations, RAID5
>should *increase* system performance.
>
>Simple explanations/discussions:
>  http://www.digidata.com/raiddesc.html
>  http://www.acc-sd.com/site/raidlevels.htm
>  http://www.adaptec.com/technology/whitepapers/raid.html (note the comment
>that "Database servers are an example" of where RAID5 works well)
>
>More extensive discussions:
>  http://www.eurologic.com/tn/tnwp2.htm
>  http://www.acnc.com/raid.html
>
>
>Steve Dirickson   WestWin Consulting
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