ACL processing refers to the special processing z/OS performs for assignable devices in which the automatic cartridge loader (ACL) feature is installed. When a job needs one of these devices, z/OS determines which devices can satisfy the mount request by looking at the type of request and applying preference logic to devices.
Use the VARY ACTIVE command to change the ACL status of an assignable device to active on all systems. When the ACL status is active, the device is preferred for non-specific, non-temporary requests, and not preferred for specific, temporary requests.
Use the VARY NOTACTIVE command to change the ACL status to inactive so the device is preferred for specific, temporary requests and not preferred for non-specific, non-temporary requests.
For example, to change the ACL status for the device 01A0, issue this command:
VARY 01A0 ACTIVE
Note: Issuing a V 01A0 ACT command for an inactive ACL only sets the status to active until z/OS determines that it should once again be inactive. For example, when an ACL tape input hopper becomes empty, it is automatically marked inactive by z/OS.
Use the MIM2032 parameter on the SETOPTION command to determine whether TPCF monitors and reports changes in the active status on the local system for an assignable device with the ACL feature activated. The active or inactive ACL status of a device affects how z/OS preferences assignable devices. Initiated by the MIM2032 message to vary the ACL status of a device to active or inactive, use of an automated rule can influence z/OS device selection, to or away from a device, based upon the type of allocation request.
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