STKSUPP—split unit affinity specifications over devices


Related topic

Using-Allocation-functions

The STKSUPP function splits unit affinity specifications across separate devices to eliminate requirements to enter or remove volumes from silos.

With STKSUPP, you can also specify default units for scratch volumes outside of silos.

When unit affinity JCL parameters force multiple DD statements onto a single drive, volumes might be required to be entered into or removed from silos. HSCs software component determines the location of the volume that is specified in the primary DD statement; volumes that are specified on secondary DD statements have to be moved to use the unit that is allocated to the affinity group.

STKSUPP alleviates the problem by splitting the affinity into groups based on tape location--for example, into a cartridge drive group and a silo group. While the affinity split requires more drives to run the job, it does not require operator intervention to enter or remove volumes from silos.

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