Storage Virtualization

Just as servers have been underutilized, so have storage devices. Many applications require that some minimum amount of storage be allocated for their use, and then in many cases, only a small fraction is actually used. Storage virtualization allows the physical storage from multiple storage devices to appear to be a single storage device to the operating system or application. The storage can then be allocated as needed for use by users, applications, and servers. Just as with server virtualization, storage virtu-alization can increase utilization to 75% or better.

There are three basic approaches for virtualizing storage. The most common (called in-fabric) is the use of storage area network (SAN) devices that are connected by a high-speed fibre channel network. Software is then installed on a host server or a storage virtualization device is installed as

Figure 10-4

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