Checking volumes in system-managed tape libraries

EDGINERS performs this checking to make sure a volume can be used in a system-managed tape library:

EDGINERS determines if a volume in a system-managed tape library can be mounted on the current system. If the volume cannot be mounted, possibly because it is defined in a TCDB on another system, DFSMSrmm skips that volume.
In order to initialize a volume in a system-managed tape library, a volume must be in a private category because the automated tape library does not support specific mounts of scratch volumes. RMM TSO command and release processing attempts to ensure that the volume is in the correct category so that EDGINERS does not have to check the volume status. Refer to Setting status for a volume in a system-managed tape library for more information about setting the status for a volume.
Note: Although the system prevents a specific mount of a system-managed scratch volume, you can scan them because EDGINERS handles the change of use attribute between SCRATCH and PRIVATE in the TCDB.
You must define a volume in a system-managed tape library to DFSMSrmm before you can initialize or erase it. Any volume not defined to DFSMSrmm will be mounted on the drive allocated by the TAPE DD statement in the JCL for EDGINERS as long as the drive is not in a system-managed library.