EU 6x 8TB RAID 10 NAS Calculator

Estimate usable TB, parity, and fault tolerance for EU homelab buyers using 6x 8TB in RAID 10.

Capacity Snapshot

Raw Capacity

48.00 TB

Usable Capacity

21.60 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	36.00 TB	1 drive	83.3%
RAID 6	28.80 TB	2 drives	66.7%
RAID 10	21.60 TB	1 drive per mirror pair*	50.0%
RAID-Z1	36.00 TB	1 drive	83.3%
RAID-Z2	28.80 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

Related Long-Tail Calculators

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Sequential Long-Tail Navigation

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FAQ

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

For EU homelab buyers, this NAS planning scenario estimates 21.60 TB usable after a 10% reserve from 48.00 TB raw.

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.

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.

Is RAID 10 still practical with 8TB drives?

It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.