By default, CA Disk dynamically allocates both the primary and duplicate copy to tape, and the tertiary copies are suppressed. The DD statements used for the primaries are //ARCHIVP1-5, the duplicate copies are //ARCHIVC1-5, and the tertiary copies are //ARCHIVC1-5. Sysparms MERPxTYP, MERCnTYP, and MERTnTYP allow you to change the defaults to tape, disk, or 3480 cartridge units as needed. Specify these sysparms with a value of DISK, TAPE, 3480, or DYNn/DYnn, and place them in the SYSPARMS member of the PARMLIB data set.
You can use the following two methods to indicate that no duplicate copy is to be made:
Because the tertiary copy is suppressed by default, MERTxTYP would need to be specified or the //ARCHIVT1-5 dd statement would have to be included. For example, to direct the primary to disk and the duplicate copy to a 3480 cartridge unit, specify MERP1TYPDISK and MERC1TYP3480.
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 devices are deallocated only at the end of the job, but not at the end of each tape. The dynamic allocation option can be made to behave in much the same way by specifying the 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 //ARCHIVC1 DD statement. For example:
//ARCHIVC1 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.
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