How Storage Virtualization Works
Storage virtualization works through mapping. The storage virtualization layer creates a mapping from the logical storage address space (used by the hosts) to the physical address of the storage device. Such mapping information, also referred to as metadata, is stored in huge mapping tables. When a host requests I/O, the virtualization layer looks at the logical address in that I/O request and, using the mapping table, translates the logical address into the address of a physical storage device. The virtualization layer then performs I/O with the underlying storage device using the physical address, and when it receives the data back from the physical device, it returns that data to the application as if it had ...
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