When a mount is requested for a Virtual Volume, a dataspace is created to process that unique combination of device and volume. These Virtual Volume dataspaces are built using 4 KB virtual storage pages or frames as units of data.
Virtual Volume performance is independent of the application data format or block size. Applications creating small block size data sets are typically not very efficient users of tapes and experience longer run times. When redirected to Virtual Volumes, CA Vtape will mask the inefficiencies of the small block size and reduce the application run time. However, these applications may require more Virtual Volumes and CA Vtape will use more CPU cycles to process them when compared with other applications writing the same amount of data with an optimized block size.
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