EU 10x 20TB RAID 10 NAS Calculator

Estimate usable TB, parity, and fault tolerance for EU homelab buyers using 10x 20TB in RAID 10.

Capacity Snapshot

Raw Capacity

200.00 TB

Usable Capacity

90.00 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	162.00 TB	1 drive	90.0%
RAID 6	144.00 TB	2 drives	80.0%
RAID 10	90.00 TB	1 drive per mirror pair*	50.0%
RAID-Z1	162.00 TB	1 drive	90.0%
RAID-Z2	144.00 TB	2 drives	80.0%

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

Is RAID 10 still practical with 20TB drives?

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

How much effective storage does 10x 20TB RAID 10 provide?

For EU homelab buyers, this NAS planning scenario estimates 90.00 TB usable after a 10% reserve from 200.00 TB raw.

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.

Should I optimize this 10-drive plan for available space 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.