Technology help: What does RAID mean?

What is RAID?

RaidRAID, or Redundant Array of Inexpensive Disks is a technique of configuring 2 or more hard disks for data security (redundancy) or performance. RAID is usually used on high-end business network servers. RAID is not necessary for the average home user's PC. Levels or types of RAID

  • RAID Level 0: Striped Disk Array with no Fault Tolerance: Provides data striping (spreading out parts of every file across multiple disk drives) but no redundancy. Improves performance but does not deliver fault tolerance. If one drive fails then all data in the array is lost.
  • RAID Level 1: Mirroring and Duplexing: Disk "mirroring". Provides twice the read transaction rate of single disks and the same write transaction rate as single disks.
  • RAID Level 2: Error-Correcting Coding: Stripes data at the bit level rather than the block level. (not common)
  • RAID Level 3: Bit-Interleaved Parity: Byte-level striping with a dedicated parity disk. Rarely used.
  • RAID Level 4: Dedicated Parity Drive: Block-level striping (like Level 0 ) with a parity disk. If a data disk fails, the parity data is used to create a replacement disk. A disadvantage is that the parity disk can be slow.
  • RAID Level 5: Block Interleaved Distributed Parity: Data striping at the byte level and also stripe error correction information. This results in excellent performance and good fault tolerance. Most popular implementations of RAID.

RAID requires special RAID Array controller hardware, or RAID support built into the operating system.




and what does all that mean

Thaks that clears a few things up for me

thanks for nice information. know im understand the meaning of raid

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