You can tell TPCF to assign a preference value to a device using the PREFERENCE parameter on the VARY command. The higher the value you specify on this parameter, the more preferred the device. You can specify a value from 1 to 255, or you can specify NONE.
For example, to make local jobs prefer device 01A0 to other devices in the EDL, assign a high preference value to this device by issuing this command:
VARY 01A0 PREFERENCE=100
Devices with preference values are preferred over devices without preference values; therefore this device would be preferred whenever possible. However, if you then assigned the value 150 to device 01A2, then 01A2 would be preferred over device 01A0 if both of these devices were available.
You can assign the same preference value to several devices, creating a preference group. You also can remove preference values by specifying PREF=NONE on the VARY command.
Note: Preferencing is only effective for devices that are eligible for the current allocation. That is, preferencing placed on devices that have been eliminated from allocation eligibility by z/OS or vendor products (robotic software, CA MIA job reserve, and so on) is ineffective since these devices cannot be used for the allocation. Similarly, preferencing placed on offline and allocated devices is ineffective since these devices cannot be used for the allocation. Also, preference values are used only as 'tie breakers' when all other types of preferencing for devices are equal. For these reasons, device preferencing may not produce the results you expected.
Note: For information on diagnosing allocations that do not follow your preferencing specifications, see the chapter “Troubleshooting.”
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