By using the SIMULATE parameter on a MERGE job, CA Disk instructs MERGE to execute without actually mounting any ARCHVOLS or moving any DSNINDEX records. The result is a report indicating which DSNINDEX and ARCHVOL records would have been selected in a live run. Fast processing cannot be simulated because no volumes are mounted and the Format 1 DSCB record is not available.
Because output devices are not allocated during simulations, CA Disk cannot accurately predict the number of output ARCHVOLS there will be in a live run. If you only want to know which DSNINDEX and/or ARCHVOL records will be selected for input by MERGE, then this is not a concern. However, certain steps need to be taken if your intent is to determine the approximate number of ARCHVOLS that will be required for output.
MERGE has a facility to simulate specific device types to predict volume capacity, and when a volume switch would occur. This is accomplished by specifying the appropriate DYNnUNIT/DYnnUNIT sysparm with the CA Disk value for the device type to be simulated as indicated below:
The DYNnUNIT/DYnnUNIT sysparm, related to the previous Media Options, should be specified with one of the cartridge device types listed in the section Simulate Mode Considerations in the chapter "XCOPY."
Note: The simulated devices represented in this table will only work when sysparm CARTCALC is specified with a value of Y. If CARTCALC is set to N, all 3480/3490 devices use CARTFEET. For more information, see the sysparm descriptions of CARTCALC, CARTPRCT, and CARTFEET of the Systems Guide.
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