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What is RAID 4?

April 26, 2017raid

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What is RAID 4?

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RAID Level 4 is a type of RAID that uses block-level striping (spreading out the blocks of each file across multiple disks) and a dedicated parity drive to store the redundant parity information that is used to achieve fault tolerance. If a data disk fails, the parity data are used to compute the contents of the “virtual” (failed) data disk. An advantage of RAID 4 is that the storage capacity of the array can be increased one disk drive at a time. A disadvantage of RAID 4 is that the parity disk can become a write bottleneck. RAID 4 has been very successful with the enterprise file servers sold by Network Appliance. The Kaleidescape Server uses a proprietary type of RAID called RAID-K which has some of the features and advantages of RAID 4.