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  3. May 2006

Re: DASD arm worksheets

Kendall speaks the truth. The old worksheets were at a point of just not being able to cover the variety of cabinets, buses, drives, RAID cards, protection type, processors, and other factors. And of course LPAR complicated them as well. 

So do the IO Math and you'll have a system that can do the work.

- Larry

Kendall Kinnear wrote:

IBM has changed to a I/O per second calculation for sizing disk on the newer 
models. The way I do it is to collect performance data to determine the current 
average I/Os per second. I then add a growth factor and multiply that by the 
number of drives on the system. I then divide that number by the number of I/Os 
per second the new disk subsystem can support per drive. That can be anywhere 
from 40 to 60 depending on how conservative you want to be. This will give an 
estimate of the number of drives to propose.

Kendall Kinnear
Consulting System i5 Architect
Stonebridge

Phone: 214-676-3146
email:   kendall.kinnear@xxxxxxxx

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