Ah, one of my favorite subjects! :-)

Actually, Clive, the counsel you received is good.  Mirrored Disk/iX
performance is excellent.  As you probably know, though, you cannot mirror
the MPEXL_SYSTEM_VOLUME_SET.  So, the best of all possible worlds for you
would be to use a Model 20 disk array for the system volume set and use
Mirrored Disk/iX for your production data volume set.

Bill

At 03:01 PM 3/10/99 -0000, Clive Just wrote:
>Does anyone have any experience with both Model 20 HA Disks and disks
>mirrored with Mirror/IX.
>
>System is currently KS979/400 running 5.5. We are looking to to upgrade our
>disks and have been warned that Model 20's are designed for availability not
>performance and that software mirroring is considerably faster.  This
>certainly goes against my intuition but where are the facts?
>
>If we went Model20 then we would only use RAID1 (mirroring) not RAID5 - does
>that swing the balance at all?
>
>All comments gratefully received.
>
>Clive Just
>
>