UK 4x 16TB RAID 6 NAS Calculator

Estimate usable TB, parity, and fault tolerance for UK homelab buyers using 4x 16TB in RAID 6.

Capacity Snapshot

Raw Capacity

64.00 TB

Usable Capacity

28.80 TB

Fault Tolerance

2 drives

Efficiency

50.0%

Safer for larger arrays with dual parity, at the cost of one extra parity disk. This scenario applies a 10% filesystem reserve.

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Alternative Mode Comparison

Mode	Usable	Tolerance	Efficiency
RAID 5	43.20 TB	1 drive	75.0%
RAID 6	28.80 TB	2 drives	50.0%
RAID 10	28.80 TB	1 drive per mirror pair*	50.0%
RAID-Z1	43.20 TB	1 drive	75.0%
RAID-Z2	28.80 TB	2 drives	50.0%

UK Buyer Context

UK homelab planners commonly balance higher per-drive pricing with power and chassis constraints, so efficient but resilient layouts become more valuable.

• Model dual-parity options early if rebuild time is a concern.
• Include reserve headroom to avoid running pools at high fill percentages.

Brand / Region Glossary

Power Budget

Expected always-on energy usage cost factored into NAS layout decisions.

Rebuild Window

Estimated time exposure while replacing a failed drive and restoring parity.

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 4x 16TB RAID 6 provide?

For UK homelab buyers, this NAS planning scenario estimates 28.80 TB usable after a 10% reserve from 64.00 TB raw.

Is RAID 6 still worth deploying with 16TB 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 storage headroom?

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 6 tolerate in this setup?

This setup can tolerate 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.