Depending on operating system requirements and operating system maximums, a data area can exist as one or more extents on one or more volumes, . If initializing an existing data set (DISP=SHR or DISP=OLD), CA Datacom/DB formats all currently 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, CA Datacom/DB 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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