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6x 12TB RAID 10 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 6x 12TB in RAID 10. Includes reserve planning for NAS and homelab arrays.

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%

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: 6x 12TB RAID 6 NAS Calculator | Usable TB Next: 6x 12TB RAID-Z1 NAS Calculator | Usable TB →

FAQ

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

This NAS planning scenario estimates 32.40 TB usable after a 10% reserve from 72.00 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.

Is RAID 10 still viable with 12TB drives?

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

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.