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RAID LEVEL 5: Independent Data Disks with Distributed Parity Blocks
Click on the diagram to see Raid 5 in action
Each entire data block is written on a data disk; parity for blocks in the same rank is generated on Writes, recorded in a distributed location and checked on Reads.
RAID Level 5 requires a minimum of 3 drives to implement
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Characteristics & Advantages
Highest Read data transaction rate Medium Write data transaction rate Low ratio of ECC (Parity) disks to data disks means high efficiency Good aggregate transfer rate
Disadvantages
Disk failure has a medium impact on throughput Most complex controller design Difficult to rebuild in the event of a disk failure (as compared to RAID level 1) Individual block data transfer rate same as single disk
Recommended Applications
File and Application servers Database servers Web, E-mail, and News servers Intranet servers Most versatile RAID level
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