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Redundant Array of Independent Disks
 Level : 0 1 2 3 4 5 6 7 10 53 General Info

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 Diagram: RAID 5

RAID Level 5 requires a minimum of 3 drives to implement

CHARACTERISTICS/
ADVANTAGES		 DISADVANTAGES
  • 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
  • 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 USES
Applications
  • File and Application servers
  • Database servers
  • WWW, E-mail, and News servers
  • Intranet servers
  • Most versatile RAID level


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