For single volume data sets, CA Disk will automatically change the primary allocation for a DEFINE request based on original allocated extents with sysparm VSSPUSED specified with a value of Y. By specifying this parameter, CA Disk will sum all of the extents that were allocated to the data set at archival time. It will then determine the amount of this space that was actually used, and if this value is larger than the original primary amount, will use the new value as the primary allocation amount. For multi-volume data sets, CA Disk will always use the original allocation amounts. If the data set is being restored to an unlike device type, the allocation amount will be changed to reflect either the increased or decreased track capacity.
In addition to sysparm VSSPUSED, the VSALLOEX user exit is available to allow a user program to change allocation amounts based on information supplied to the exit.
If a new allocation amount is specified on the RESTORE command via the ALLOC=, DALLOC= or IALLOC= parameters, the value specified will be used directly without any conversions.
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