The data area can exist as one or more extents on one or more volumes, depending on operating system requirements and operating system maximums. If initializing an existing data set (DISP=SHR or DISP=OLD), CA Datacom/DB formats all current allocated tracks for use. If initializing a new data set (DISP=NEW), CA Datacom/DB requests and formats the primary allocation only if one volume is provided. If multiple volumes are provided, it requests secondary allocations until space has been allocated on the number of volumes specified. For a description of how the operating system handles secondary allocations, see your operating system JCL manual.
If the keyword VOLUMES= is specified with a number value that is less than the number of volumes provided, the INIT function only initializes the number specified in the VOLUMES= keyword. For example, for a DD statement with VOL=SER=(VOL001,VOL002,VOL003), without the VOLUMES= keyword DBUTLTY initializes 1 to 16 extents on VOL001, 1 to 16 extents on VOL002, and 1 (or more) extents on VOL003. But with the VOLUMES= keyword set as VOLUMES=2, DBUTLTY initializes 1 to 16 extents on VOL001 and one (or more) extents on VOL002. Unused extent possibilities on VOL002 and VOL003 are available for dynamic extend.
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