The IBM ATL and VTS can be attached to multiple systems in two main configurations. The first is to partition the box – make it look like two separate boxes – each section attached to a different system or share the ATL or VTS with different systems. In fact, you can partition the box and have one partition shared between some systems and have the second partition shared between different systems.
In most cases, when the ATL or VTS is going to be shared between different operating systems, the box is partitioned. One partition is used by z/OS (most likely shared by a couple of z/OS systems) and one partition is used by the other operating system (z/VM for example). In a partition mode, the ATL/VTS operates as if it were two separate boxes and tape volumes cannot be shared. So tapes created in one partition cannot be used in the other partition.
For more information about sharing or partitioning an ATL or VTS, it is strongly recommended that you review the DFSMS Object Access Method Planning, Installation, and Storage Administration Guide for Tape Libraries.
When sharing an ATL or VTS between z/OS systems there are four different ways to configure your CA 1 and OAM environment:
Each of these presents slightly different requirements and can meet different needs. The section following provide some items within the CA 1 supplied exits that may need customization depending on your environment.
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