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  3. August 2005

IBM disk arm reduction "rule of thumb"

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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