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Memory for disk arrays

This scheme is designed for storage applications, where the data was originally divided into small blocks, so there's no need for additional but they split. RAID 4 is a good solution for file servers, with the information to which it reads and essentially rarely recorded. The scheme has low storage cost-heavy, but its implementation is complex as the restoration of data on failure. Advantages: -- very high speed reading large amounts of data; -- high productivity with high-intensity reading data queries; -- small overhead for the implementation of redundancy. Disadvantages: -- quite a complicated implementation; -- very low productivity in data recording; -- complex data recovery; -- Low-speed data reading with a small amount of single queries; -- asymmetry performance on reading and writing. iii. RAID 5 - tolerant array of independent disks distributed entirely clear (Independent Data disks with distributed parity blocks) RAID Level 5 - it is tolerant array of disks with distributed storage contracts trolnyh amounts . Blocks of data and checksums, which are calculated in the same way as in RAID 3, cyclically recorded on the disks array, that is, there is no dedicated disk for the storage of information on the amounts of control. In the case of a RAID 5 array drives all have the same size, however, the total capacity of the distribution Koch subsystem available for writing, it becomes less exactly on the same CD.
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