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To me, the general consensus seems to be that users are seeing a pretty
drastic reduction of disk arms (making use of the 15k RPM drives and the
new controllers) and getting the same or greater performance. Pretty
vague, but that's what i've noticed.
Al Barsa
<barsa@barsaconsu
lting.com> To
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Unfortunately, I don't know of a rule of thumb.
However, this is why IBM is adding faster drives, and more cache on the
IOAs.
Al
Al Barsa, Jr.
Barsa Consulting Group, LLC
400>390
"i" comes before "p", "x" and "z"
e gads
Our system's had more names than Elizabeth Taylor!
914-251-1234
914-251-9406 fax
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http://www.as400connection.com
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il.gov
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Hello All,
Does anyone know if IBM has a "rule of thumb" on the acceptable level of
disk arm reductions? We are in the process of developing a configuration
for a new 520. Our current 820 has 18 disk arms. One vendor suggests
reducing to 8 in the main box (no tower). Another vendor recommends 12
utilizing a tower. The reasoning is that at our current peak disk
accesses, we would need that many to keep the disk ops/second at 60 or
below. Both quotes are for 4326 35G/15K disk units.
All comments/suggestions would be most appreciated.
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