You can contribute to the efficiency of allocation processing throughout your installation in several ways:

• For devices:
  • Use the device preference table, specified through the Hardware Configuration Definition (HCD) to set up the order for device allocation. See the z/OS MVS Device Validation Support appendix for a listing of the device preference table installation's devices as esoteric groups, and to group them for selection by allocation processing.
  • Use the eligible device table (EDT) to identify the I/O devices that you want to include in the esoteric groups.

    For more information on the device preference table and the EDT, see z/OS HCD Planning.

• For volumes, use the VATLSTxx members of SYS1.PARMLIB to specify volume attributes at IPL.
• For data sets, you can specify the JCL used for your installation's applications according to the device selection criteria you have set up through the HCD process and IPL.