RAID is short for redundant array of independent (or inexpensive) disks. Redundancy provides fault tolerance. In other words, if a fault occurs in one drive, your system can tolerate the fault and continue to operate. Several different RAID types are available. When studying for Security+, you should be aware of the following topics.
- RAID-0 (also known as striping) does not provide any fault tolerance but increased performance.
- RAID-1 (also known as mirroring) uses two disks and provides fault tolerance.
- RAID-5 (also known as striping with parity) uses at least three disks and provides fault tolerance while also providing increased performance. The equivalent of one drive is dedicated to parity.
- RAID-10 (also called 1+0) combines RAID 1 and RAID-0. A variant is 0+1. Both provide fault tolerance and increased performance for specific applications.
Good luck in your studies