RAID 5

RAID 5 configuration

RAID 5 stripes data at a block level across several drives, with parity equality distributed among the drives. The parity information allows recovery from the failure of any single drive. Write performance is rather quick, but because parity data must be skipped on each drive during reads, reads are slower. The low ratio of parity to data means low redundancy overhead.
RAID 5

Minimum number of drives required: 3

Performance: Average

Redundancy: High

Efficiency: High

Advantages:

  • Fault tolerant
  • High efficiency
  • Best choice in multi-user environments which are not write performance sensitive

Disadvantages:

  • Disk failure has a medium impact on throughput
  • Complex controller design

Due to the increased controller CPU performance, many companies are now choosing RAID 6 over 5 as it offers double the data protection.  Considering that drive capacities are now 12TB.

RAID 0 ¦ RAID 1 ¦ RAID 0+1 ¦ RAID 10 ¦ RAID 5 ¦ RAID 6 ¦ RAID 50 ¦ RAID 60

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