SPLIT improves the performance of the volume mount analyzer for those installations that use lengthy include/exclude filter lists during the volume mount analyzer study. Long filter lists cause processing overhead.

Because GFTAVMA compares each filter specified against each SMF 14/15 record in the input file, it is not unusual for some installations to have GFTAVMA runs with excessive elapsed time. Of course this excessive elapsed time is also dependent upon large numbers of SMF 14/15 records that are passed through the filters.

To eliminate the overhead during the GFTAVMA runs, use the SPLIT keyword to split the GFTAXTR output data set into two subset data sets. When specified, SPLIT directs the SMF 14/15 records into either the include or exclude data set.

After using SPLIT, you do not have to worry about the excluded records again or pay for the excessive filtering overhead. The subsequent GFTAVMA runs are against one of the two SPLIT output data sets created during the initial SPLIT run.