EU 6x 12TB RAID 10 NAS Calculator

Estimate usable TB, parity, and fault tolerance for EU homelab buyers using 6x 12TB in RAID 10.

Capacity Snapshot

Raw Capacity

72.00 TB

Usable Capacity

32.40 TB

Fault Tolerance

1 drive per mirror pair*

Efficiency

50.0%

Excellent random I/O and rebuild behavior; capacity is typically 50% of raw. This scenario applies a 10% filesystem reserve.

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Alternative Mode Comparison

Mode	Usable	Tolerance	Efficiency
RAID 5	54.00 TB	1 drive	83.3%
RAID 6	43.20 TB	2 drives	66.7%
RAID 10	32.40 TB	1 drive per mirror pair*	50.0%
RAID-Z1	54.00 TB	1 drive	83.3%
RAID-Z2	43.20 TB	2 drives	66.7%

EU Buyer Context

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

• Choose a layout that minimizes emergency rebuild risk under continuous operation.
• Prefer capacity plans that survive one upgrade cycle without pool redesign.

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.

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

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 available space?

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 10 tolerate in this setup?

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

How much usable storage does 6x 12TB RAID 10 provide?

For EU homelab buyers, this NAS planning scenario estimates 32.40 TB usable after a 10% reserve from 72.00 TB raw.