Required SMF Records

GFTAXTR input must contain SMF record types 14, 15, and 21. The input must also contain the data from record type 30 (sub-types 4 and 5) or record types 04, 05, 34 and 35.

If record types 4, 5, 21, 30 (sub-types 4 or 5), 34, or 35 do not match their corresponding type 14/15 records, GFTAXTR discards them.

Note: Record types 14 and 15 are mandatory input to GFTAXTR because they are the tape data set records. If you do not supply type 14 and 15 SMF records, or if GFTAXTR processing excludes all type 14 and 15 records through filtering, GFTAVMA processing terminates with a return code of 8.

GFTAXTR re-creates information from missing step end (type 4), job end (type 5), and demount (type 21) SMF records. When type 21 records are missing, GFTAXTR generates a type 21 record for every data set open record, which creates far more demounts than actually occurred. In some cases, type 4 and type 5 SMF records for long running jobs such as DFSMShsm™, IMS/ESA®, or other started task jobs are not included in the collected SMF records. This is because the job or step might have started before the sample collection began or ended after the sample collection ended. GFTAXTR therefore re-creates these records.

Obviously, the degree of accuracy is much higher if the information for all record types is supplied in the SMF records instead of being re-created.

Although GFTAVMA will not terminate with errors if type 21 SMF records are missing, you must include type 21 records in the analysis because the information in type 21 records is critical to GFTAVMA's ability to reconstruct the flow of jobs and to accurately report on tape mounts.

Note: You must have type 21 records to do a tape analysis. You cannot accurately study tape mounts without analyzing the type 21 SMF records. This is because without these records, the values in all of the volume mount analyzer reports are inaccurate.