The CA Dynam/T interface provides the means for sharing a common set of volumes with one common scratch pool between these two tape management systems.
When a volume from the common scratch pool is written on, the tape management system under which the volume was opened for output owns the volume. The owning system sends information to the sharing system, notifying it that tape is no longer available for use as a scratch tape. The owning tape management system can provide all of its services (such as vault management) for the volumes it owns. It is also responsible for scratching the volume when it expires and notifying the other system(s) that the volume is available for use.
When notification is received about a volume used by the other system(s), the non-owning system records the information about the volume and provides real-time protection for it. None of the other services provided by that tape management system are available for that volume (except some reporting and batch maintenance utilities). When notification is received that the volume is scratched, the volume is marked as scratch and is once again available to each system.
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