Some advanced storage options such as Redundant Array of Independent/Inexpensive Drives (RAID) and Global Network Block Device (GNBD) are discussed in this section.
RAID is a data storage scheme for dividing and replicating data among multiple hard disk drives. It spreads data among several physical hard drives with enough redundancy so that should any drive fail, the data will still be intact. Once created, a RAID array is a device that can be used pretty much like a regular partition. It provides increased data reliability and greatly improved input and output performances.
The three key concepts in RAID are as follows: