Redundancy occurs when parallel database systems keep copies of each data item (or division) on many nodes. Explain why it is preferable to spread copies of data items assigned to a node among many other nodes rather than keeping all copies in the same node. (or a group of nodes) Section B discusses in depth the advantages and disadvantages of employing RAID storage as opposed to keeping an additional duplicate of each data item. b.

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Parallel and Distributed Storage

A parallel storage file system is a sort of clustered file system. A clustered file system is a storage system shared by multiple devices simultaneously.