Re: DASD Performance -- MIDRANGE-L

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>And besides we still get guidlines from IBM that based on model and
>feature you need something like x arms for low I/O, x*3 for medium and
>x*5 for intense I/O (formula is mine just as an example!).  For an S20
>4way I believe the numbers are something like 15, 45, and 70.  Arms DO
>matter!

Larry's right--arm guidelines abound. Another example of IBM's arm-centric
rules of thumb is IBM's stern admonishment that the Model 170 can only
support 10 disk arms max--with the implication that more is better.

rp


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