During the external design phase, you should:
- Estimate the network, processor, and DASD loading based on the dialog
between users and tasks (that is, the input to each transaction, and consequent
output).
- Revise your disk access estimates. After external design, only the logical
data accesses are defined (for example, EXEC CICS READ).
- Estimate coupling facility resources usage for the MVS™ system logger and resource
files, or any cross-system coupling facility (XCF) activity.
Remember that, after the system has been brought into service, no amount
of tuning can compensate for poor initial design.
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