Disk storage designers recognize that if one component can only be pushed so far addition gain in the performance are to be had by using multiple parallel components in the case of disk storage this leads to the development of arrays of disk that operate independently and in parallel with multiple disk separate I/ request can be handled in parallel as long as the data reside on separate disk.
Further single I/O request can be executed in parallel if the block of data to be accessed is distributed across multiple disk.With the use of multiple disk there is wide variety of ways in which data can be organized and in which redundancy can be added to improve reliability. This could make it difficult to develop data base scheme that are usable on number of plat form and operating system. Fortunately industry has agreed on standardized on scheme for multiple disk data base design know as RAID.
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