RAID is short for redundant array of independent disks.
RAID storage uses multiple disks in order to provide fault tolerance, to improve overall performance, and to increase storage capacity in a system.
How RAID Works
With RAID technology, data can be mirrored on one or more disks in the same array, so that if one disk fails, the data is preserved. Thanks to a technique known as striping (a technique for spreading data over multiple disk drives), RAID also offers the option of reading or writing to more than one disk at the same time in order to improve performance.
In this arrangement, sequential data is broken into segments which are sent to the various disks in the array, speeding up throughput. A typical RAID array uses multiple disks that appear to be a single device so it can provide more storage capacity than a single disk.
How RAID is organized?
Two independent aspects are clearly distinguished in the RAID organization.
The organization of data in the array (RAID storage techniques: striping, mirroring, parity, combination of them).
Implementation of each particular RAID installation – hardware or software.
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