Configuring Your Product › Tailoring and Other Considerations › Archive/Backup Considerations › Specifying the Archive Medium for Archive/Backup

Specifying the Archive Medium for Archive/Backup

By default, CA Disk dynamically allocates both the primary and duplicate copy to tape. The DD statement used for the primary is //ARCHIVE0 and for the duplicate copy is //ARCHIVEC. Sysparms ARC0TYPE and ARCCTYPE allow you to change the defaults from tape to either disk or 3480 cartridge units. Specify these sysparms with a value of DISK, TAPE or 3480, and place them in the SYSPARMS member of the PARMLIB data set.

There are 2 ways to indicate that no duplicate copy is to be made:

1. Specify NULL to sysparm ARCCTYPE as NULL
2. In JCL, specify DUMMY to the //ARCHIVEC DD statement

For example, to direct the primary copy to disk and the duplicate copy to a 3480 cartridge unit, specify ARC0TYPEDISK and ARCCTYPE3480.

You can also specify the archive medium through JCL. If tape or 3480 devices are specified using JCL, the devices allocated at job initiation are used throughout the run; that is, the device are not deallocated at the end of each tape, but only at the end of the job. The dynamic allocation option can be made to behave in much the same way by specifying sysparm DYNUKEEP. The only exception is when more than five volumes are needed to contain a single archive data set, in which case dynamic allocation is used.

You can also specify archival to disk in JCL by allocating any disk device to the //ARCHIVE0 DD statement. For example:

//ARCHIVE0 DD UNIT=SYSDA,VOL=SER=anyvol,DISP=SHR

Notice that this only indicates to CA Disk to use disk archive. The volume (or data set) named on the DD statement has no meaning to CA Disk, and dynamic allocation of the ARCHVOL is still done.