The media options previously shown relate to system parameters that provide the esoteric unit name CA Disk uses to allocate the proper device for writing, reading and auto restoring. These system parameters are placed in the SYSPARMS member in PARMLIB and should not be changed unless the esoteric name changes, or a media type has been totally removed from CA Disk control. The DYNn/DYnn sysparm provides the flexibility of defining additional device types to CA Disk that can be installed at various sites.
When a tape is created, CA Disk stores the device type in the ARCHVOLS record along with a flag if the DYN1, through DY20 option was used. With this information, CA Disk retrieves the esoteric unit name from the DY__UNIT or ARESUN__ sysparm so the proper device can be allocated.
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