GFTAXTR designates data sets with an access pattern of one open for input and one open for output as backup copy (BCOPY). Although these data sets do not match the definition of backup data sets, in actuality, many BCOPY data sets are indeed a form of backup. This includes backups that have been recovered as well as backups that are written and then immediately copied to produce a vault copy.

If the open for input immediately follows the open for output on the same day, GFTAXTR categorizes the data set as USAGE(SINGLE). If the opens do not occur within the same day, GFTAXTR categorizes the data set as USAGE(BCOPY). This is a useful category to filter on to determine what this pattern of access means to your installation.

When calculating the values for the Estimate Report (see The Estimate Report), the volume mount analyzer categorizes BCOPY data sets as the tape mount management data set category of active and honors the LEVEL0AGE and LEVEL1AGE keyword specifications to determine where each data set should reside in the storage hierarchy.