"The storage capacity and data retrieval speeds of Hard Disks have increased multiple folds in last few years. However for large business organizations, which not only need to store terabytes of invaluable data but access them frequently as well. These organizations cannot afford to let their systems go offline even for a short duration of time. Moreover they cannot even think of loosing even small amount of data due to disk failure or for that matter any other reason.
"A single hard disk cannot fulfill all these requirements no matter how large is the storage capacity or how good the performance and quality of disk is. The need here arises of a system that can store large volumes of data, provides fault tolerance, scalable in terms of increasing storage capacity and above all that can be reliable..."
