The Improved Data Recording Capability Report

The Improved Data Recording Capability (IDRC) Report is a simulation report. This simulation report shows how you can change the tape usage at your installation using IBM hardware technology.

Use the keyword REPORT(IDRC) or REP(IDRC) to generate the IDRC Report.

For this example, these keywords were specified:

REPORT(IDRC) LARGE (1500) TAPEDEV (3490E) IDRCFACTOR (3) TAPELEN (2)

These keywords specify that GFTAVMA generate an IDRC Report that shows data sets that are larger than 1500MB. The LARGE keyword was set to 1500 in this example to limit the report to a size that would be a good example report. Normally, you would select a LARGE keyword value that is the size of the tape cartridges at your installation.

Start with the LARGE default of 600 and increase the value if your sample is too big to be useful. For the IDRC calculations, the TAPEDEV, IDRCFACTOR, and TAPELEN keywords direct GFTAVMA to model to a 3490E with an IDRC compaction ratio of 3 and a tape length of 2. If you specify LARGE (0), GFTAVMA evaluates all data sets as candidates for IDRC compaction.

The default for the keyword that was not specified was:

BLKSIZE defaulted to 32 760

Note: Do not specify GDG(GROUP) for the IDRC Report. See GDG Keyword for more information.