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RAID is a technology that combines multiple disk drives into logical units for data redundancy, performance, or both. Learn about the history, levels, and benefits of RAID, as well as its applications and variations.
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- RAID level 0 – Striping. In a RAID 0 system data are split up into blocks that get written across all the drives in the array. By using multiple disks (at least 2) at the same time, this offers superior I/O performance.
- RAID level 1 – Mirroring. Data are stored twice by writing them to both the data drive (or set of data drives) and a mirror drive (or set of drives). If a drive fails, the controller uses either the data drive or the mirror drive for data recovery and continuous operation.
- RAID level 5 – Striping with parity. RAID 5 is the most common secure RAID level. It requires at least 3 drives but can work with up to 16. Data blocks are striped across the drives and on one drive a parity checksum of all the block data is written.
- RAID level 6 – Striping with double parity. RAID 6 is like RAID 5, but the parity data are written to two drives. That means it requires at least 4 drives and can withstand 2 drives dying simultaneously.
Jun 10, 2024 · RAID (Redundant Arrays of Independent Disks) is a technique that uses multiple disks for data storage and improves performance, reliability, and availability. Learn about different types of RAID, such as RAID-0, RAID-1, RAID-5, and RAID-6, and their evaluation criteria.
RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks or solid-state drives (SSDs) to protect data in the case of a drive failure. There are different RAID levels, however, and not all have the goal of providing redundancy.
Jan 9, 2024 · RAID is a storage technology that combines multiple disks into a virtual unit to improve performance, reliability, and accessibility. Learn about the history, concepts, and benefits of RAID, and the eight types of RAID levels with examples.
