A volume count parameter is required by the operating system when more than five tape volumes are mounted for a single Data Definition (DD) name. An application that writes a full 3490E tape that was compressed with IDRC will require a volume count parameter when it is switched to write to uncompressed 400 MB or 800 MB Virtual Volumes.
Virtual Volume Compression reduces the need to code volume count parameters in application JCL.
Using 2000, 4000, 8000, and 16000 MB Virtual Volumes reduces the need to use Virtual Volume Compression and increase CPU usage, while also reducing the need to code a volume count parameter in application JCL.
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