If you do not have DFSMShsm, skip this section.
The DFSMShsm tape interface consists of the following modules:
Is an alias of ARCTVEXT. This module allows DFSMShsm controlled tapes to be released to the CA 1 scratch pool through TMSTMSTV when DFSMShsm has determined the tape is no longer needed.
DFSMShsm controlled tapes are recognized in the TMC by the EDM bit in FLAG3 (X'20'). The EDM part is set ON at OPEN for output time based on rules in the CA 1 options member (TMOEDMxx) of the hlq.CTAPOPTN library.
The IBM DFSMShsm tape volume exit. DFSMShsm calls this exit to inform a tape management system that all valid data has been removed from a tape volume.
Note: For more information about this user exit, see the IBM DFSMShsm Implementation and Customization Guide.
To identify DFSMShsm tapes as EDM controlled tapes to CA 1® Tape Management, update the TMOEDMxx member of the CA common options library. Set the EDM parameter to any name in up to four characters. This helps identify which EDM controls the tape if multiple EDMs are active in your data center.
The parameters, JOB=, DSN=, PGM=, and DD= are optional. However, at least one must be present. Pattern Masking can be used for any or all four of the optional parameters, and any combination may be included. Based on this set of selection criteria, if a tape is found to match all specified criteria, it is defined as EDM controlled and assigned the specified EDMID
Once these options are set, all DFSMShsm created tapes are indicated as controlled by an External Data Manager (EDM) and CA 1® Tape Management expires them when told to by DFSMShsm.
A CA 1® Tape Management user exit, CTSJUEDM is available to further define data sets which should be flagged by CA 1® Tape Management as externally managed.
Note: For more information, see the Programming Guide.
To ensure that DFSMShsm functions properly as an EDM to CA 1® Tape Management, review the following DFSMShsm options:
Set this option to SCRATCH.
Set this option to SCRATCHTAPE.
Important! Failure to set this option can result in DFSMShsm overwriting data on a non-scratch tape if the HSM tape pool does not have sufficient tapes available. .
Update the SYS1.PARMLIB member ARCCMDxx with the following:
SETSYS EXITON(ARCTVEXT)
Note: For more information about these options and how they are reset within DFSMShsm, see the IBM DFSMShsm System Programmer's Reference.
Important! Tracking HSM tapes in CA 1® Tape Management without the EDM interface in use can result in tapes being scratched erroneously.
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