Hardware RAID
Hardware RAID (Redundant Array of Independent Disks) is a data storage technology that uses a dedicated hardware controller to combine multiple physical disk drives into a single logical unit for improved performance, reliability, or both. It manages data distribution, redundancy, and error correction at the hardware level, offloading these tasks from the host system's CPU. Common RAID levels include RAID 0 (striping for performance), RAID 1 (mirroring for redundancy), and RAID 5 (striping with parity for a balance of both).
Developers should learn and use hardware RAID in scenarios requiring high-performance, fault-tolerant storage for critical applications, such as database servers, enterprise file servers, or video editing workstations. It is particularly valuable when system reliability and data availability are paramount, as it provides hardware-based redundancy and can often support hot-swapping of failed drives without downtime. Compared to software RAID, it offers better performance by reducing CPU overhead and may include additional features like battery-backed cache for data protection during power failures.