Hi, Denys,

We use one of each of the arrays in your list, in addition to a C2258HA,
all of which totally constitute our system volume set.  I have noticed
performance degradation due, most likely, to the mismatched sizes of the
three arrays and because of the low number of spindles.  Disk service times
on these three volumes can reach horrendously high values, IMO --  40-60ms
--, and utilization is practically 100% on all three during peak usage
hours.  Part of my plans for this year include migrating $SYS (my short
name) to our EMC Symmetrix array, both for performance and redundancy
protection.

FWIW, these old Cascade-series arrays and all their other cousins in our
data center have been extremely reliable in providing adequate RAID-3
protection.  We never experienced a minute's downtime due to a physical
disk failure.  We do have a mech (HDA) fail from time to time, but HP has
always been timely about getting us a replacement mech for a hot-swap and
rebuild.

Lee Gunter
Regence Blue Cross Blue Shield of Oregon / Regence HMO Oregon

mailto:[log in to unmask]
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==========================================================
The opinions expressed, here, are mine and mine alone, and do not
necessarily reflect those of my employer.




From: [log in to unmask] on 04/28/98 09:56 AM

Please respond to [log in to unmask]


To:   [log in to unmask]
cc:    (bcc: Lee Gunter/BCBSO/TBG)
Subject:  Arrays on MPEXL_SYSTEM. . .




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Gentle HP 3000 list members, I would like to know if anyone is using the
C2254HA or the C2252HA, the disk arrays, as members of
MPEXL_SYSTEM_VOLUME_SET. If you do have these arrays on that volume set,
how many do you have?  Have you observed any system performance
degradation? Do you have any other comments?

Kind regards,
Denys. . .
Denys Beauchemin
HICOMP America, Inc.
(800) 323-8863  (281) 288-7438         Fax: (281) 355-6879
denys at hicomp.com                             www.hicomp.com