RAID (Redundant Array of Independent Disks) is a data storage technology that combines multiple physical hard drives or solid-state drives into a single logical unit to improve data redundancy, performance, or both. It works by distributing data across several drives using techniques like disk mirroring (copying identical data on multiple drives) and disk striping (splitting data into blocks spread across drives), which can be combined depending on the RAID level used.
RAID provides several key benefits:
- Data redundancy: Protects against data loss if one or more drives fail by storing copies or parity information.
- Improved performance: Allows simultaneous input/output operations across multiple drives, speeding up data access.
- Increased storage capacity: Combines the capacity of multiple drives into one logical volume.
RAID arrays appear to the operating system as a single drive, simplifying management. Different RAID levels (e.g., RAID 0, RAID 1, RAID 5) offer various balances of fault tolerance, speed, and capacity, with some focusing on redundancy and others on performance.
In summary, RAID is a versatile storage solution designed to enhance data reliability and system performance by leveraging multiple disks working together.
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