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Systems & Data Center · Foundational

RAID 6

Striping with dual distributed parity across four or more drives, tolerating two simultaneous drive failures.

Definition

Usable capacity is (n-2) drives and the write penalty is six I/Os. RAID 6 is favored for large-capacity arrays because it survives a second failure or unreadable sector during rebuild.

Example

Eight 10 TB drives in RAID 6 provide 60 TB usable.

Exam tip

RAID 6: minimum four drives, capacity n-2, write penalty 6, survives two failures.

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