DASD tuning

The main solutions to DASD problems are to:

Reducing the number of I/O operations

The principal ways of reducing the number of I/O operations are to:

Tuning the I/O operations

This can reduce service time. The principal ways of tuning the I/O operations are to:

Balancing I/O operations

This can reduce queue time. The principal ways of balancing I/O operations are to:

Take the following figures as guidelines for best DASD response times for online systems:

Aim for multiple paths to disk controllers because this allows dynamic path selection to work.

Related tasks
MVS and DASD: improving performance
Reducing MVS common system area requirements
Splitting online systems to improve availability
Making CICS nonswappable
Increasing the CICS region size
Using job initiators
Tuning the region exit interval (ICV)
Using LLA (MVS library lookaside)
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