Figure 1 shows the programs that are responsible for the top 75% of the tape mounts in this GFTAVMA run.

Figure 1. The Top Report

 1  # MOUNTS % TOT column shows the number of mounts and the percent of the total mounts for each RANK. The Top Report is ranked according to the associated number of mounts sorted in descending order, and RANK 1 is the program responsible for the most number of mounts at this installation.

 2  CUM MNTS % TOT column shows the total mounts for the programs. Usually less than 20 programs account for more than 70% of the mounts. In this example, 13 programs were responsible for 75.9% of the mounts.

Reading across the rows of this example, you see that the first row (RANK 1) shows that the program IDCAMS created 12386 data sets (# DSNS column), which account for 17.3% of the mounts (% TOTAL # OF MOUNTS column). These data sets have an average size of 16.0MB (AVG SIZE column). None of these data sets are greater than the LARGE value of 600MB (> LARGE column).

Contrast this with the second row of the report (RANK 2), which shows that 3273 data sets were created by the program IEBGENER (# DSNS column). These data sets account for 14.2% of the mounts (% TOTAL # OF MOUNTS column). The average data set size is only 7.9MB, and only three of the data sets are greater than the LARGE value. Therefore, you can reduce many mounts by using just one program filter (IEBGENER).

The fourth row (RANK 4) shows that only four programs are responsible for almost half (49.4%) of all mounts (% TOTAL CUM MNTS column). These same four programs are also responsible for creating 52.8% of all the tape data sets in this run (% TOTAL OF CUM DSN column).

Therefore, you can filter on four programs and reduce your mounts by 49.4%.