Specifying output volumes is required for the COPY DATASET command in a non-SMS-managed environment. (For a discussion of SMS considerations for moving data, see Moving SMS-managed data sets.)

You can specify multiple target volumes with the OUTDDNAME or OUTDYNAM keywords. This allows you to specify spill volumes. These spill volumes are used if the data sets you are moving require more space than is available on your first choice of volume.

If the output volume has unexpired data sets, you can either not process the data sets or write over them.

DFSMSdss now distinguishes between non-SMS and SMS volumes specified in the OUTDDNAME or OUTDYNAM keywords. For non-SMS allocations, only the volumes that are non-SMS are considered for allocation. Similarly, only SMS volumes are considered for SMS allocations.

The distinction between SMS and non-SMS is also used when determining the volume count for a multivolume allocation. Where volume count is determined from the number of specified volumes, only those volumes eligible for the type of allocation (SMS volume for SMS allocation or non-SMS volume for non-SMS allocation), processing proceeds with a null volume list.

There are several reasons for distinguishing between SMS and non-SMS volumes:

• Non-SMS volumes cannot be used for SMS allocations
• Specifying non-SMS volumes interferes with SMS guaranteed-space allocation
• Reducing volume count problems
• Improving the ability of DFSMSdss to process both non-SMS and SMS allocations in a single operation

For non-SMS output volume selection, DFSMSdss selects volumes based on size of the allocation necessary. The first volume that has enough space will be used for the allocation. When moving data sets with the extended attributes variable DS1EATTR set in the VTOC, the system selects non-SMS output volumes as follows:

1. EATTR=NO: All volumes will be considered for allocation.
2. EATTR = OPT: For both VSAM and non-VSAM data sets, DFSMSdss prefers EAVs when the data set organization and type is supported in the EAS and the data set’s size is greater than the BPV. EATTR = OPT is the default. If EATTR is not specified, it is the same as EATTR = OPT.

Preferring EAVs means that all volumes that are EAVs will be evaluated before any non-EAVs are even considered. If the EAVs in the list of output volumes cannot satisfy the allocation request, all of the output volumes will then be evaluated to accommodate the allocation request.