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R A I D
- Redundant Array of Independent Disks -

A QUICK UNDERSTANDING



RAID-0, pronounced "Raid Zero," is aptly named & defined as a non-redundant group of striped disk drives without parity. If one drive in a RAID-0 array crashes, the entire array crashes. However,

RAID-0 is the fastest and most efficient array type but offers no fault tolerance.



RAID-1, or "disk mirroring," is simply a pair of disk drives which store duplicate data, but apears to the computer as a single drive. Mirroring improves the read performance and leaves the write performance unchanged.

RAID-1 is the array of choice for performance-critical, fault-tolerant environments, and is the only choice for fault tolerance if no more than 2 drives are used.



RAID-2 arrays sector-stripe data across groups of drives.

RAID-2 offers no significant advantages over RAID-3.

RAID-3 and RAID-2, sector stripe data across groups of drives, but with RAID-3, one drive in the group is dedicated to storing parity information, and relies on the embedded ECC in each sector for error detection.

RAID-3 arrays cannot overlap I/O and thus give best performance in single-user, single-tasking environments with long records.



RAID-4 is identical to RAID-3 except that large stripes are used, allowing read operations to be overlapped. however,since all write operations must update the parity drive, they cannot be overlapped.

RAID-4 offers no significant advantages over RAID-5.



RAID-5 or "rotating parity array," avoids the write bottleneck caused by the single dedicated parity drive of RAID-4. unlike RAID-4, each drive takes turns storing parity information for a different series of stripes.

RAID-5 is the best choice in multi-user environments which are either not performance sensitive, or do little or no write operations.



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