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Subject:	Re: Model 20 disc array
From:	Craig Lalley <[log in to unmask]>
Reply To:	Craig Lalley <[log in to unmask]>
Date:	Wed, 9 Mar 2005 09:24:15 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (29 lines)

--- Bill Lancaster <[log in to unmask]> wrote:
> John,
>
> You never, ever want to us RAID 5 on MPE, with any of the HP products.
> The performance is awful.

With all due respect, I disagree.  The reason Raid 5 is poor on the Mod 20's and Autoraid 12H is
that they don't have enough memory.  (If your brave, the Mod20 will work with 128MB of FPM memory
per controller, not sure if will help though.)

The VA7XXX series supports a full 2GB of cache, which is really a redundant 1GB, but that is more
than enough to do Raid5.

Also, after doing some studies, there is really no difference between Raid5 and Raid1 on the
XP512.

I know someone running a XP256, but I have never really looked closely enough at the performance,
lets just say the XP512 is a LOT faster.

-Craig

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