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RAID 5
RAID 5 includes disk striping at the byte level and parity. In RAID 5, the parity
information is written to several hard disk drives. RAID 5 is best suited for networks that
perform a lot of small I/O transactions simultaneously.
RAID 5 addresses the bottleneck issue for random I/O operations. Since each hard disk
drive contains both data and parity numerous writes can take place concurrently. In
addition, robust caching algorithms and hardware based exclusive-or assist make RAID 5
performance exceptional in many different environments.
Point
Description
uses
RAID 5 provides high data throughput, especially for large files. Use RAID 5 for transaction
processing applications because each hard disk drive can read and write independently. If a hard
disk drive fails, the StorTrends® iTX Software uses the parity stored on each of the other hard
disk drives to recreate all missing information. Use also for office automation and online
customer service that requires fault tolerance. Use for any application that has high read request
rates but low write request rates.
strong points
Provides data redundancy and good performance in most environments
weak points
Hard disk drive performance will be reduced if a hard disk drive is being rebuilt. Environments
with few processes do not perform as well because the RAID overhead is not offset by the
performance gains in handling simultaneous processes.
hard disk drives
Three to 32 hard disk drives
Appendix A : RAID 217
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