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RAID 5

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RAID 5

(Redundant Array of Independent Disks Mode 5) A popular disk or solid state drive (SSD) subsystem that increases safety by computing parity data and increasing speed by interleaving data across three or more drives (striping). RAID 5 is similar to RAID 3, except that RAID 5 parity is distributed among all drives, whereas RAID 3 uses separate parity drives.

RAID 6
Similar to RAID 5 but not as widely used, RAID 6 performs either two parity computations instead of one, or it performs the same parity computation on overlapping subsets of the data. Using four drives, RAID 6 can recover from two failed drives. See RAID parity, RAID 3, RAID 0 and RAID.


RAID 5 - Speed and Fault Tolerance
With data and parity striped across three or more drives, RAID 5 has been a popular method for obtaining speed and safety.
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References in periodicals archive
RAIDIX operates with the RAID 0, RAID 5, RAID 6, and RAID 10 levels.
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The Inevitable Vulnerability of RAID 5 Is Solved by RAID 6
Improving data availability with RAID 6
RAID 5+1 is designed to overcome the limitations of RAID 1+0 and RAID 5 by combining the two.
RAID[sup.n]: a revolutionary alternative to expensive, unreliable RAID
When properly implemented, SATA technology can be used as the foundation of a cost-effective solution that can compete with Fibre Channel RAID 5 solutions, and which brings greater value to the data center.
SATA for business critical applications: the mirroring advantage; Affordable, mirrored SATA drives overcome FC RAID-5 obstacles
Both "read" and "write" performance for RAIDn are on a par with conventional RAID 5 implementations, and faster than typical compound RAID 1+5 or RAID 5+5 configurations.
RAIDn poised to revolutionize storage protection. (Top Technology Showcase)
As shown in Figure 1 of Compaq's "RAID Advanced Data Guarding: A Cost-Effective, Fault-Tolerant Solution" white paper, RAID 0 with 56 hard drives has a much higher probability of data loss then RAID 5, which can tolerate one drive failure with no data loss.
New 15K drives provide more than speed: they offer increased safety in multi-TB storage. (High Availability)
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Back-end switching in storage server design: improves the performance and availability of storage systems. (High Availability)
The card's hardware features include an expandable cache with 128MB of memory, a battery backup module, and a dedicated Adaptec XOR engine that sharply improves write performance in RAID 5 applications.
Adaptec adapts to enterprise server market with 5400s
Statistically, all companies that store their data on RAID 5 systems agree with this idea and it turns out that 75% of the RAID 5 storage systems running today have one or more Hot Spares running and providing this insurance ...
The Mythical Hot-Spare
IDE: RAID 1 (with two or more drives) and IDE RAID 5 (with three or more drives) permits a failed drive to be pulled out of the PC enclosure and a new drive swapped for it without stopping the system.
Trends In RAID Technology
Both "read" and "write" performance for [RAID.sup.n] are on a par with conventional RAID 5 implementations and faster than typical compound RAID 1+5 or RAID 5+5 configurations.
LAND-5 Introduces Revolutionary RAID Technology
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