Scratch Pooling › Specific Mount Message Processing › External Data Manager Specifications

External Data Manager Specifications

If an External Data Manager (EDM), such as DFHSM, is to control the CA TLMS tapes, you must supply the information about the tapes.

An externally managed tape is as follows:

• Created through an authorized program (APF authorized), and the program is linked AC=1.
• Matches the selection criteria for one of the External Data Manager IDs (EDMID) specified in the CTOEDMxx member of CAI.CTAPOPTN.

An EDMID is an eight-character field that is stored in the VMF Volume record to identify which EDM controls that tape. Within this member, you can specify multiple EDMIDs. Duplicate EDMIDs are allowed. The same EDMID can identify multiple sets of definitions.

Specifications

The following parameters are specified in the CAI.CTAPOPTN member, CTOEDMxx. If more than one option (except EDM) is specified, an AND condition is assumed (all specifications must be met). A mask can be provided for PGM, DSN, JOB, and DD.

DD

The ddname (up to eight characters)

DSN

The data set name (up to 44 characters)

EDM

A name identifying the EDM (up to eight characters)

JOB

The job name (up to eight characters)

PGM

The program name (up to eight characters). Must be APF authorized.

Multiple EDMs can be specified in this member. Full pattern masking is supported.

The following example illustrates how all DFHSM managed tapes would be placed under EDM control:

EDM=HSM1,DSN=*.MIGTAPE.-,PGM=ARCCTL
EDM=HSM1,DSN=*.DUMP.-,PGM=ARCCTL
EDM=HSM1,DSN=*.BACKTAPE.-,PGM=ARCCTL

The Scratch Pool Management feature allows a scratch pool to be assigned to an EDM. The scratch pool assignment control statement that is defined in member CTONSMxx of CAI.CTAPOPTN supports the specification of an EDM ID with the scratch pool name:

EDM=HSM1 ,POOL= HSM1VOLUMES

EDM=HSM1 is assigned the scratch pool HSM1VOLUMES. When a tape belongs to the EDM HSM1, output scratch processing requests volumes from the HSM1VOLUMES scratch pool. This scratch pool must be defined to the CTOSCRxx member. See Using Scratch Pool Management for further scratch pool management.

Default

Member CTOEDMxx is distributed with null values. If no EDM is used, no action is required. You can use the user exit CTSUXEDM to define data sets managed externally.