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RAID Level:
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RAID 5: Independent Data disks with distributed parity blocks


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





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

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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
  • WWW, E-mail, and News servers
  • Intranet servers
  • Most versatile RAID level





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