The design of the CA Disk ISAM reports allows for maximum information about the data set to be printed when scanning any single volume. Only the fields that can be calculated for the given volume are printed. Consequently, for ISAM data sets spread across two or three volumes, different fields will be printed for each volume.
The report is printed in data set name sequence. If several volumes are scanned in a single report, portions of the data set on different volumes will be grouped together, but the information for each volume is listed separately.
When it is determined that part of the data set resides on another volume, this information is printed in the first line of the report, specifying the volume if it can be determined.
For example:
SAMPLE.DATA SET PACK01 has O, PACK99 has I and/or P
where O, I, and P see overflow, index and prime areas.
The percentage of space that is idle is printed at the right side of the REPORT for easier reference. Since ISAM allocation is limited to multiples of whole cylinders, controlling space allocation is somewhat harder. The most important item to check is probably the percentage of prime that is idle. If this is high, then a check for the total tracks of prime allocated should be done. For a one-cylinder data set with only one track used (94 percent idle on a 3330), nothing can be done to reduce the size.
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