RAIDtehnoloogiaid

RAID, which stands for Redundant Array of Independent Disks, is a data storage technology that combines multiple physical disk drives into one or more logical units. This is done for purposes of data redundancy, performance improvement, or both. Different RAID levels offer varying balances between these goals.

RAID 0, also known as striping, splits data across multiple disks without redundancy. This improves performance significantly by allowing simultaneous read and write operations. However, if any single drive fails, all data on the array is lost.

RAID 1, or mirroring, duplicates data across two or more drives. This provides excellent redundancy, as the data can be accessed from the remaining drive if one fails. However, it requires twice the storage capacity for the same amount of data, and performance gains are typically minimal.

RAID 5 uses block-level striping with distributed parity. It offers a good balance of performance, storage efficiency, and fault tolerance. Data and parity information are spread across all drives, allowing the array to continue operating even if one drive fails, with parity information used to reconstruct the lost data.

RAID 6 is similar to RAID 5 but uses two distributed parity blocks, providing even greater fault tolerance against multiple drive failures. This comes at the cost of slightly reduced write performance compared to RAID 5.

Other RAID levels exist, such as RAID 10 (a combination of RAID 1 and RAID 0) and RAID 50, which build upon the fundamental principles of striping, mirroring, and parity to achieve specific storage objectives for various applications and workloads.