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10x 18TB RAID 10 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 10x 18TB in RAID 10. Includes reserve planning for NAS and homelab arrays.

Capacity Snapshot

Raw Capacity

180.00 TB

Usable Capacity

81.00 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 5 145.80 TB 1 drive 90.0%
RAID 6 129.60 TB 2 drives 80.0%
RAID 10 81.00 TB 1 drive per mirror pair* 50.0%
RAID-Z1 145.80 TB 1 drive 90.0%
RAID-Z2 129.60 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 18TB RAID 6 NAS Calculator | Usable TB Next: 10x 18TB RAID-Z1 NAS Calculator | Usable TB →

FAQ

How much real-world usable storage does 10x 18TB RAID 10 provide?

This NAS planning scenario estimates 81.00 TB usable after a 10% reserve from 180.00 TB raw.

Is RAID 10 still worth deploying with 18TB drives?

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

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.

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.