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10x 8TB RAID 5 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 10x 8TB in RAID 5. Includes reserve planning for NAS and homelab arrays.

Capacity Snapshot

Raw Capacity

80.00 TB

Usable Capacity

64.80 TB

Fault Tolerance

1 drive

Efficiency

90.0%

Balanced capacity and redundancy, but rebuild stress can be high on large disks. This scenario applies a 10% filesystem reserve.

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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

← Previous: 10x 8TB RAID 1 NAS Calculator | Usable TB Next: 10x 8TB RAID 6 NAS Calculator | Usable TB →

FAQ

How much real-world usable storage does 10x 8TB RAID 5 provide?

This NAS planning scenario estimates 64.80 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.

Should I optimize this 10-drive plan for storage headroom or resiliency first?

For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.

How many disk failures can RAID 5 tolerate in this setup?

This setup can tolerate 1 drive. Real-world survivability depends on mirror placement, rebuild stress, and drive health.