System Use Reporting › System Use Report Samples › Disk and Tape Activity Graphs

Disk and Tape Activity Graphs

The Tape Drive Occupancy Report identifies the percent of the available tape drives busy during any time interval. The Disk and Tape EXCP Rates Report requires CONFIG statements for generation. It correlates heavy tape and disk activity. While the occupancy report identifies what percentage of tape drives is allocated, the EXCP Rates Report indicates how much they are being used.

• The scope of the report can be SHIFT n (n=1 through 3), DAILY, denoting a single day data, or TOTAL, denoting multiple day data summarized into one graph.
• The graph titles are TAPE DRIVE OCCUPANCY and DISK AND TAPE EXCP RATES.
• The MP factor, present on each graph, is an indicator of how busy the machine was during each interval.
• A numerical representation of the percentages, which are being graphed, are listed on the left of the report. The numbers in the FLD1 column represent the total length of the TAPE DRIVE OCCUPANCY bar: the total of all programs/jobs. The numbers in the FLD2 and FLD3 columns represent the disk and tape EXCP rate, respectively. The total length of each bar on the DISK AND TAPE EXCP RATES graph is the total of FLD2 and FLD3.
• The vertical time-of-day axis. The increment for each time interval is specified on the SYSUSE1 statement.
• The number of days on which data was found for each time interval is displayed on the right of the report. This is shown only for multiday summary reports.
• The LEGEND provides a cross-reference between the percentage columns and the graphs, shows the symbols used on each graph, and gives the meaning of 100 percent for each graph. An entry on the SYSUSE2 statement is available to standardize the DISK AND TAPE EXCP RATES graph scale. This scale defaults to the maximum disk and tape EXCP rate observed in any time interval.