CA Vtape uses Data-In-Virtual (DIV) to map dataspaces to its DASD buffer LDSs. The memory occupied by these dataspaces is used to buffer Virtual Volume data before writing it to the LDSs. This provides higher throughput performance for jobs reading or writing data to CA Vtape Virtual Volumes. Unchecked, these dataspace buffers would normally require a large storage footprint; however, CA Vtape minimizes the size of the dataspaces to ensure that they do not burden memory resources. CA Vtape also gives you with the control to prioritize its use of memory as opposed to CPU utilization within your environment.
CA Vtape can be run in one of two modes, STANDARD or ISOLATION, which is controlled by the SVTn SET CPU console command. Standard Mode is the recommended mode.
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