Similarly, great flexibility in controlling the creation of new archive volumes is provided through command parameters and system parameters.
By using the LIMITS parameter, you can specify that archive data sets are to be written to up to five new archive volumes, each containing only data sets within a given range of expiration dates.
Note: SMS-managed data sets are not selected by the LIMITS parameter.
You can also control the device type(s) to which the new archives are to be written through the dynamic allocation sysparms MERPnTYP and MERPnNAM. The most suitable archive medium for each range can also be specified; for example, one range can be written to disk archive data sets, another to tape, and yet another to tape cartridge.
Note: Recent advancements in the cartridge technology field have substantially improved the CA Disk Merge process. Cartridge capacities have increased allowing Data Centers to maintain a smaller number of ARCHVOLS. For an example of this technology, see the section StorageTek Redwood Device in the chapter "General Information" and the section IBM's Magstar 3590 Tape Device in the chapter "General Information." Merge also allows you to produce duplicate and/or tertiary copies concurrently with the creation of the new archive volumes. This is accomplished through dynamic allocation by specifying sysparms MERCnTYP/MERCnNAM or MERTnTYP/MERTnNAM. This process is sometimes referred to as triplexing, and is the most efficient way to produce multiple copies. The copies can also go to different device types, much like the primary copies.
You can, however, create additional copies by executing an extra job step following the primary merge. A duplicate copy or tertiary copy can be produced depending on what is created in the primary merge. See COPY for a further description.
The CA Disk MERGE PROC has the COPYFILE DD statement used when specifying the MERGE COPY parameter. The COPYFILE can be set to //COPYFILE DD DUMMY, if not used.
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