CTTSCA – Data set Contention Detection

The CTTSCA utility analyzes SMF records to detect potential data set contentions, meaning, a situation in which two data sets on the same volume need to be accessed at the same time.

The SMF records processed by the CTTSCA utility are read from a sequential file referenced by DD statement DASMFIN. The sequential file must contain relevant accumulated type 14 and type 15 SMF records.

The CTTSCA utility performs one or both of the following tasks for each potential contention:

• Creates Control-M/Tape rules that disallow stacking the data sets on the same volume
• Adds the data set pair to a report produced by the utility

Run this utility before implementing the Dynamic Dataset Stacking facility. Review rules created by the utility and, if appropriate, add them to a rule table that is listed in Control-M/Tape Rule Table member RULLIST in the Control-M/Tape PARM library.

After implementing the Dynamic Dataset Stacking facility, run the CTTSCA utility periodically (for example, once a month) to check for new data set contentions. How often this utility is run depends on the number of tape mounts performed daily at your site.