The IBM 3494 ATL and 3494 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 you can share the 3494 ATL or 3494 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.
Normally, when the 3494 ATL or 3494 VTS is going to be shared between different operating systems; the box is partitioned. So 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 3494 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 on sharing or partitioning a 3494 ATL or 3494 VTS, it is strongly recommended that you review the DFSMS Object Access Method Planning, Installation, and Storage Administration Guide for Tape Libraries manual (or "PISA" manual for short).
When sharing a 3494 ATL or 3494 VTS between z/OS systems there are four different ways to configure your CA TLMS and OAM environment:
Each of these presents slightly different requirements and may meet different needs. Below are some of the items within the CA TLMS supplied exits that may need to be customized depending on your environment.
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