Explanation: SWITCHTAPES is an optional parameter that defines when to release those tapes mounted to process data set backup commands.
| Subparameter | Explanation |
|---|---|
| DSBACKUP | SWITCHTAPES(DSBACKUP) is a required subparameter that specifies that the data set backup function performs a demount of all mounted data set backup tapes. |
You can use the following optional parameters with the SWITCHTAPES parameter.
| Subparameter | Explanation |
|---|---|
| TIME | SWITCHTAPES(DSBACKUP(TIME(hhmm))) specifies the time of day to demount mounted data
set backup tapes. For hhmm, specify the planned demount time.
If you specify TIME with hhmm as zero, DFSMShsm does not
demount any mounted tapes. If the tape is mounted but not actively
processing a data set, the demount occurs at the time indicated by
TIME. If a tape is actively processing a data set, DFSMShsm demounts
the tape at the end of the current data set.
Note: The hhmm format
expresses time as a four-digit decimal number that is based on the
24-hour clock. The hh specifies the hour and mm specifies
the minutes. For example, you can specify 1:15 p.m. as 1315, and you
can specify midnight as 2400. The maximum value you can specify for hh is 24, the maximum value you can specify for mm is
59, and the maximum value you can specify for hhmm is 2400.
|
| AUTOBACKUPEND | SWITCHTAPES(DSBACKUP(AUTOBACKUPEND)) specifies that DFSMShsm demounts all tapes that were mounted for data set backup at the end of the autobackup cycle. Before the autobackup cycle ends, all retries (data sets that were in use when the initial attempt to backup occurred) complete. |
| PARTIALTAPE | SWITCHTAPES(DSBACKUP(PARTIALTAPE)) specifies the method that DFSMShsm uses to mark a single-file format output tape as full or available for reuse when a switch tape event occurs. |
| SETSYS | SWITCHTAPES(DSBACKUP(SETSYS)) specifies that the SETSYS PARTIALTAPE value is used. |
| REUSE | SWITCHTAPES(DSBACKUP(REUSE)) specifies that all partial tapes demounted with the SWITCHTAPES option remain selectable in the DFSMShsm inventory as partial tapes. |
| MARKFULL | SWITCHTAPES(DSBACKUP(MARKFULL)) specifies that DFSMShsm marks full all partial tapes demounted with the SWITCHTAPES option. If backups are going to the IBM® Virtual Tape Server (VTS) subsystem, refer to the SETSYS PARTIALTAPE parameter description for performance considerations. |
Defaults: TIME(0) is the default if you specify the SWITCHTAPES(DSBACKUP) command without specifying the TIME or AUTOBACKUPEND parameters. MARKFULL is the default if you specify the SWITCHTAPES(DSBACKUP) command without specifying the PARTIALTAPE parameter.