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10x 8TB RAID 6 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 10x 8TB in RAID 6. Includes reserve planning for NAS and homelab arrays.

Capacity Snapshot

Raw Capacity

80.00 TB

Usable Capacity

57.60 TB

Fault Tolerance

2 drives

Efficiency

80.0%

Safer for larger arrays with dual parity, at the cost of one extra parity disk. This scenario applies a 10% filesystem reserve.

Run Interactive Calculator →

Alternative Mode Comparison

Mode	Usable	Tolerance	Efficiency
RAID 5	64.80 TB	1 drive	90.0%
RAID 6	57.60 TB	2 drives	80.0%
RAID 10	36.00 TB	1 drive per mirror pair*	50.0%
RAID-Z1	64.80 TB	1 drive	90.0%
RAID-Z2	57.60 TB	2 drives	80.0%

NAS Cluster Guides

NAS Hub RAID Level Compare RAID Capacity Matrix Planning Quick Sheet RAID Selector NAS FAQ

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Sequential Long-Tail Navigation

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FAQ

How much real-world usable storage does 10x 8TB RAID 6 provide?

This NAS planning scenario estimates 57.60 TB usable after a 10% reserve from 80.00 TB raw.

Can this calculator replace real-world benchmark and rebuild testing?

No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.

Why include a 10% reserve when planning NAS storage headroom?

Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.

How many disk failures can RAID 6 tolerate in this setup?

This setup can tolerate 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.