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iStrobe Online Help

Analyzing the Resource Demand Distribution Report

If most of the wait time is attributed to files, examine the Data Set Characteristics report for buffers, block sizes, CI/CA splits and the EXCP count.

If most of the wait time is attributed to .FILEMGT, look at:

the Wait Time by Module report to get the function description of the modules in which the wait state began
the Attribution of CPU Wait Time report to see which transactions and modules invoked the functions associated with the wait time (for example, which transactions and modules open and close files).

Use the Distribution of activity over run time graph to understand when tasks and files were busy:

Vertical blank spaces on this report may be due to wait time for tape mounts. Look at the Wait Time by Module report to see if there is wait in tape activities (End of Volume, Open, Close, and so on). Also look at the I/O Facility Usage report to see which file the wait is associated with. Additional tape drives might help reduce this time.
If the report shows two or more files to be busy simultaneously, check the Resource Demand Distribution report to see if they are causing wait. If they are, check the I/O Facility Usage report to see if these files are on the same pack. If these conditions are true and if the files are accessed sequentially, consider moving one or more of the data sets to a different pack to eliminate this contention.