storage virtualization - Computer Definition
Treating storage as a single logical entity without regard to the hierarchy of physical media that may be involved or that may change. It enables the applications to read from and write to a single pool of storage rather then individual disks, tapes and optical devices. Also called "file virtualization," it allows excess capacity on a server to be shared, and it can make migration from one file server to another transparent to the applications. See HSM, storage management, SAN and virtualization. Not Necessarily "Virtual Storage" Storage virtualization deals with a pool of storage devices. The term "virtual storage" may refer to storage virtualization; however, it is also an alternate term for "virtual memory," which is employed by every desktop operating system to expand the computer's main memory (see virtual memory).