If [set the ca1tm variable for your book] is installed with the YSVC option set to YES in the TMOOPTxx member of the [set the ca1tm variable for your book] CTAPOPTN data set, the CA Vtape started tasks (default names SVTS and SVTSAS) may need READ and UPDATE access to the YSVCUNCD resource. The access is required when the CA Vtape TapeManagementSystem attribute in the Dynamic Options Section of the CA Vtape parmlib is set to CA1 or AUTOMATIC.
With the interface active, CA Vtape tries to update the TMC ACTVOL field with the stacking location of a Virtual Volume. If the appropriate security access is not provided, these updates fail with various error messages like the following:
IEFTMS70 9YY-112 OPCODE=24,UPDATE ACCESS TO THE TMC NOT AUTHORIZED
Note: For more information, see the section CA 1 SVC Call Processing (YSVC) in the chapter "CA 1 Passwords and Security" in the CA 1 Tape Management Programming Guide.
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