Whats virtual storage in MVS?
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An addressing scheme that allows external disk storage to appear as main storage.
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Each running program can assume it has access to all of the storage defined by the architecture's addressing scheme.
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a and b
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a or b
Virtual storage in MVS (Multiple Virtual Storage) encompasses both aspects: it makes external disk storage appear as main storage to programs AND allows each running program to assume it has access to the full address space defined by the architecture. This virtualization enables efficient memory utilization and program isolation.
Virtual storage in MVS is an addressing scheme where the operating system maps addresses used by a program to physical memory and disk (paging), letting more memory appear available than physically exists. As a consequence of this scheme, each running program (address space) behaves as though it has access to the full range of storage defined by the architecture's addressing (e.g., 16MB, 2GB, etc.), because each gets its own private virtual address space. Both statements describe true, complementary aspects of virtual storage, so 'a and b' together is the accurate answer rather than either alone.