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EU 4x 8TB RAID 6 Calculator

Estimate usable capacity, fault tolerance, and efficiency for EU homelab buyers using 4x 8TB in RAID 6.

Capacity Snapshot

Raw Capacity

32.00 TB

Usable Capacity

14.40 TB

Fault Tolerance

2 drives

Efficiency

50.0%

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

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Alternative Mode Comparison

Mode Usable Tolerance Efficiency
RAID 5 21.60 TB 1 drive 75.0%
RAID 6 14.40 TB 2 drives 50.0%
RAID 10 14.40 TB 1 drive per mirror pair* 50.0%
RAID-Z1 21.60 TB 1 drive 75.0%
RAID-Z2 14.40 TB 2 drives 50.0%

EU Buyer Context

EU deployments often place additional emphasis on energy efficiency and predictable lifecycle upgrades, especially for always-on NAS fleets.

Brand / Region Glossary

Lifecycle Planning

Capacity and reliability strategy across multiple hardware refresh cycles.

Operational Headroom

Intentional free-space margin to protect performance and snapshot behavior.

Related Long-Tail Calculators

2x 4TB RAID 1 2x 6TB RAID 1 2x 8TB RAID 1 2x 10TB RAID 1 2x 12TB RAID 1 2x 14TB RAID 1 2x 16TB RAID 1 2x 18TB RAID 1 2x 20TB RAID 1 3x 4TB RAID 1 3x 4TB RAID 5 3x 4TB RAID-Z1 3x 6TB RAID 1 3x 6TB RAID 5 3x 6TB RAID-Z1 3x 8TB RAID 1

FAQ

How much real-world usable storage does 4x 8TB RAID 6 provide?

For EU homelab buyers, this NAS planning scenario estimates 14.40 TB usable after a 10% reserve from 32.00 TB raw.

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.

Should I optimize this 4-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.

Why include a 10% reserve when planning NAS available space?

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