Chapter 6. Data extraction 215
TLMS uses the CBRUXENT exit to interface the IBM 3494 and IBM 3495
Automated Tape Library Dataservers. You can test the DFSMSrmm version of
this exit once you have completed the conversion.
The CBRUXVNL exit is optional. If you use it, however, as with the CBRUXENT
exit, you must test it in the DFSMSrmm environment after conversion.
The installation-wide exits that you installed with DFSMSrmm for either
IGXMSGEX, CBRUXENT, CBRUXEJC, and CBRUXCUA can replace any
existing exits you had previously installed. Decide whether you still require the
function your previous exits provided, even if for a short time while introducing
DFSMSrmm. If you no longer need the function, proceed with the next
implementation step. If you still require the function, consider how to implement
it, while still providing the function required by DFSMSrmm.
See the DFSMSrmm Implementation and Customization Guide, SC26-7405, for
more details on the DFSMSrmm programming interface that you use with
EDGTVEXT, IGXMSGEX, and the OAM exits. The supplied source code for
these exits shows how to call the programming interface. You can either modify
the supplied exit to call a modified version of your old exit, or modify your old exit
to call the DFSMSrmm programming interface. Consider how you might provide
an option to disable your code without another code modification. In either case,
install the changed software by using an SMP/E USERMOD.
Based on the decisions you have taken about VRS management values and
scratch pooling, you can update the supplied sample installation exit,
EDGUX100, and the dynamic table produced by the conversion programs, to
perform the function you require.
We recommend you use the sample EDGUX100 exit that is shipped with
DFSMSrmm as SAMPLIB member EDGCVRSX.
For more information about DFSMSrmm exits, refer to the DFSMSrmm
Implementation and Customization Guide, SC26-7405.
6.2.6 Data set overwrite
TLMS supports two volume statuses:
PRIVATE The volume contains valid data.
SCRATCH The volume can be used for scratch output requests.
In an DFSMSrmm environment you have three different volume statuses:
MASTER A private volume that contains data.
SCRATCH The volume can be used for scratch output requests.

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