ISC Availability · Updated November 2026
RAID 0, 1, 5, or 10: Which One Gives Redundancy?
RAID combines drives for performance, redundancy, or both, but not every RAID level protects against drive failure.
RAID 0
Uses striping to improve performance and capacity utilization but provides no redundancy. One drive failure can destroy the array.
RAID 1
Mirrors data across drives, improving redundancy at the cost of storage efficiency.
RAID 5
Uses striping with distributed parity and can tolerate a qualifying single-drive failure in a standard configuration.
RAID 10
Combines mirroring and striping for strong performance and redundancy but requires more drives and storage overhead.
The takeaway
RAID 0 stripes without redundancy. RAID 1 mirrors. RAID 5 uses distributed parity. RAID 10 combines mirroring and striping.
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FAQ
Does RAID 0 provide fault tolerance?
No.
Which level uses mirroring?
RAID 1, and RAID 10 incorporates mirroring.
Does RAID replace backups?
No.