Why Data Redundancy?
Data redundancy, although taking up extra space, adds to disk reliability. This means, that in case of disk failure, if the same data is also backed up onto another disk, we can retrieve the data and go on with the operation. On the other hand, if the data is spread across multiple disks without the RAID technique, the loss of a single disk can affect the entire data.
RAID (Redundant Arrays of Independent Disks)
RAID (Redundant Arrays of Independent Disks) is a technique that makes use of a combination of multiple disks for storing the data instead of using a single disk for increased performance, data redundancy, or to protect data in the case of a drive failure. The term was defined by David Patterson, Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987. In this article, we are going to discuss RAID and types of RAID their Advantages and disadvantages in detail.