Storage virtualization

In computer science, storage virtualization is "the process of presenting a logical view of the physical storage resources to" a host computer system, "Treating all storage media in the enterprise as a single pool of storage.


Technology to presents a logical view of physical storage resources to hosts.

Direct-attached storage is digital storage directly attached to the computer accessing it and opposite to storage accessed over a computer network. Examples: DAS include hard drives, solid- state drives, optical disc drives, and storage on external drives.

Network-attached storage (NAS) is a type of dedicated file storage device that provides local area network (LAN) nodes with file- based shared storage through A standard Ethernet connection.

SAN: Dedicated access of specific portion (called LUN) of the storage. This is block level storage. ISCI (lower performance & lower cost, data transfer: supports 1gigabit/sec) or FC (better performance, requires dedicated card (HBA) on server, 4 gigabit/sec) protocol is used here within network switch. Uses dedicated network & top data security provider for large scale organization


  • Increased storage utilization.
  • Adding or deleting storage without affecting application’s availability.
  • Non-disruptive data migration

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