GFTASRT2 is the part of the GFTAVMA summary report that shows how much of your tape media actually contain data. This report reflects the latest contents of the volume. The data sets that reside on a particular volume might be old versions of the data sets, but they are the current contents of the volume.

In the volume analysis phase, only volume level processing is completed. Since the SMF sample represents a time period, it is possible for the same data set to have been re-written several times on multiple volumes. See Statistical Volumes for an explanation of unique volsers.

For example, if data set 'X' is written ten times onto ten different tape volumes during the sample, all these tape volumes and their associated mounts are included in the volume level processing. GFTAVMA analyzes all of these volumes to show an accurate picture of how well your volumes are used over time, even though only one of the volumes contains valid data in this case.

Figure 1 shows the tape volume serial (volser) statistics. In this report, keywords were not specified.

Figure 1. GFTASRT2 Summary Report—Tape Volser Processing Phase (The # character in Volume Mount Analyzer reports represents the word "number").

 1  The total number of unique volume serials (UNIQUE VOLSERS) is a total volume count taken from the volume perspective (a count of all unique tape volume serials). In this example, the total is 8909.

The GFTASRT2 volume counts are the total gross volume counts. If you run GFTAVMA against one single-file, single-volume data set that was created five times on five different volumes, the GFTASRT2 volume count is five. However, the GFTASRT3 statistical volume count for the data set is one, the current version of the data set. See Statistical Volumes for more details.

 2  Single-file volumes contain a single data set or part of a single data set. See Single/Multi Volume/File Data Sets for more information.

 3  Multifile volumes contain more than one data set. The data sets might be complete, or they might be pieces of data sets that are continued on other volumes. See Single/Multi Volume/File Data Sets for more information.

 4  Returned Scratch volumes are volumes on which all data set copies are obsolete. GFTAVMA has found a more recent copy of every data set, and these volumes are eligible to return to the scratch pool.

To determine the number of scratch volumes, GFTAVMA searches for the most current version of a data set and assumes that its other versions are on volumes returned to scratch. For example, Volume 1 contains data set A on Monday, but Volume 2 contains data set A on Wednesday. Thus, GFTAVMA determines that Volume 1 has been returned to scratch and counted it as a scratch volume.

 5  GFTAVMA obtains the average number of megabytes per volume from the information in the SMF records, which were generated at the time the data set was closed. This information does not reflect the effect of IDRC compaction. So, for devices with the IDRC feature, the number of megabytes are non-compacted megabytes. However, any software compaction, such as DFSMShsm compaction, occurs in the processor and is reflected in the SMF data.

 6  FORCECAP sets a maximum capacity of data per volume based on cartridge or volume size: 416MB for 3490E cartridges, 208MB for 3490 and 3480 cartridges, and 169MB for 3420 tape volumes. See The Importance of FORCECAP for more information.