Like physical tapes, you can share Virtual Volumes among systems. Also like physical tapes, if the systems do not share the Tape Management System (TMS) Database, the tape usage is not completely documented, the tape security can be flawed, and application JCL changes may be required to mount the shared tapes.
For example, if a tape is defined only in the TMS Database on system A and written to on system B, the mount is not documented in the Database. Because the system B Database is not controlling the usage of this tape, an unauthorized user might read or write to this tape. If the TMS is configured to disallow the mounting of tapes that are not documented in the Database, you may need to code a TMS override in the application JCL to mount the tape on system B.
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