Redundant Array of Independent/ Inexpensive Disks (RAID)
RAID is a set of physical disk drives viewed by the OS as a single logical drive
Data are distributed across the physical drives of an array
Redundant disk capacity is used to store parity information, which guarantees data recovery
RAID Levels: various levels of performance and redundancy
- the disks are divided in strips: physical blocks, sectors, or similar
- the strips are mapped round robin on the array
- I/O requests can be processed in parallel