z/OS MVS Programming: Workload Management Services
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I/O Delay Plot

z/OS MVS Programming: Workload Management Services
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I/O Delay Plot

SRM uses the I/O Delay plot when assessing increasing or decreasing a service class period’s I/O priority.

I/O Delay Plot

x axis
The combined maximum I/O demand of service class periods with I/O priorities above a given priority.
y axis
The ratio of I/O delay time to I/O using time at that priority scaled by 16.

Maximum I/O demand is the maximum percentage of time that work units in a service class period would use non-paging DASD devices if they were experiencing no I/O delay. Maximum I/O demand is represented as a percentage scaled by 10.

The I/O delay plots are recorded in the subtype 4 records.

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