As companies rely more and more on e-commerce, online transaction processing, and databases, the amount of information that needs to be managed and stored can intimidate event he most seasoned of network managers. While servers do a good job of storing data, their capacity is limited, and they an become a bottleneck if too many users try to access the same information. Instead, most companies rely on peripheral storage devices such as RAID disks, optical storage systems, and even tape libraries. These storage devices are effective for backing up data online and storing large amounts of information.
But as server farms increase in size, and as companies rely more heavily on data-intensive applications such as multimedia, the traditional storage model isn't quite as useful. This is because access to these peripheral devices can be slow and it might not always be possible for every user to easily and transparently access each storage device.
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