Interface between DISK and Control-T (CTT)
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Interface between DISK and Control-T (CTT)


Article ID: 263000


Updated On:


Disk Backup and Restore - MVS


What to do to implement the correct interface between DISK and BMC Control-T (CTT).


Release : 


Below the steps to perform to correctly set up the interface:

  •   Control-T should have a rule to define for EDM control the Disk programs:
     PGM ADSMI002  
  • BMC should provide an exit called TMSCTLEX that should be re-linked and made available to DISK in order to dialog with CTT.
  • In the DISK SYSPARMS the following parm should be specify:  TMSCTLEXTMSCTLEX.

Additional Information

Below the techdoc sections related to the above steps:

  • About IXMAINT process :

Delete Expired Data Sets and Volumes


The DSNDELETE command deletes the expired data sets in the archives from the DSNINDEX....

 In addition, CA 1, EPIC, RMM, or Control-T (CTT) customers should read the section  Method 1 - Controlling Tapes Through the EDM


  •  About EDM definition and exits :

 Method 1 - Controlling Tapes Through the EDM

Disk uses the CA 1 External Data Manager (EDM) interface to manage product tapes.
EDM gives an extra level of protection against tape volumes from being erroneously expired, before the controlling application is finished with the tape....

The activation of EDM support is done in two parts:
- First, sysparm TMSCTLEX must be set to indicate to use the Disk EDM program as the tape management interface...
- Second, Disk must be identified as the EDM 



TMSCTLEX - Tape Management System Control Interface Exit



Although you can choose to write the External Data Manager (EDM) exit yourself, the following LOAD module members are supplied as part of the Disk system located in the CCUWLOAD library.

Support the EDM interface developed for CA 1. Using this program is the preferred method of interfacing with CA 1. For more instructions on the implementation, see the following sections:
Configuring Your Product
Customizing the Disk Tape Management Support
Method 1 - CA 1.
Support the EDM interface developed for EPIC for z/VSE.
Support the EDM interface developed for IBM DFSMSrmm.
Support the EDM interface developed for TLMS.

Some tape management systems vendors have developed their own EDM interface to our software, such as Zara (Automedia) or Control-T(CTT). If your tape management system is not listed here, contact the tape management system vendor to discover if an EDM exit is available.

  • Some suggestions from BMC about any abend in TMSCTLEX code during DISK batch procedures:

Control-M/Tape - CA-DISK/DMS - The EDM volume are not scratched


Use the steps described below to activate the CA-Disk interface to Control-M/Tape.
The TMSCTLEX exit is called by CA-Disk whenever a tape volume no longer contains any valid data.
The exit marks the volume as scratch in the Media Database and, optionally, interfaces with the automated tape library at the site.

The logical explanation for this problem is that there is still an old copy of the TMSCTLEX exit in the path used by CA-DISK/DMS. This module is still the interface with CA1/TLMS.

This means that DMS will call the old TMSCTLEX interface to pass the TAPE volume to set as SCRATCH.

- Ensure that the CA-DISK/DMS STC has been restarted to use the new TMSCTLEX EXIT.
- Check carefully the CA-DISK/DMS STEPLIB and then the LINKLIST.
Remove/Rename any TMSCTLEX module that is NOT from CONTROL-M/Tape installation.
The TMSCTLEX module from BMC Software will contain the string: "BMC SOFTWARE INC"

To locate any module TMSCTLEX in LINKLIST the ISRDDN command can be used.
Under ISPF TSO option 6
Enter command : ISRDDN
Enter command : M TMSCTLEX
Each iteration of the module will be highlighted in the list.