RAID (Redundant Array of Independent Disks)
Short definition
Storage virtualisation that combines multiple disks for redundancy, performance, or both.
RAID is the umbrella term for storage virtualisation schemes that combine multiple physical disks into one logical unit. The common levels: RAID-0 (striping for performance, no redundancy), RAID-1 (mirroring for redundancy, half capacity), RAID-5 (single-disk parity, one disk worth of redundancy), RAID-10 (mirrored stripes, half capacity, fastest with redundancy). Modern systems often use ZFS or btrfs which provide RAID-equivalent capability with additional features (snapshots, checksums, send/receive).
For offshore hosting customers, RAID is most visible on dedicated server tiers — entry dedicated typically RAID-1 (2 mirrored NVMe drives), mid-tier RAID-1 with bigger drives, top-tier RAID-10 (4 drives in mirrored stripes). VPS plans don't expose RAID directly to customers; the host operates RAID at the hypervisor level.
Connected concepts
Adjacent definitions worth knowing in the same context.
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