UK 6x 8TB RAID-Z2 NAS Calculator

Estimate usable TB, parity, and fault tolerance for UK homelab buyers using 6x 8TB in RAID-Z2.

Capacity Snapshot

Raw Capacity

48.00 TB

Usable Capacity

28.80 TB

Fault Tolerance

2 drives

Efficiency

66.7%

Popular TrueNAS default for medium arrays; dual-parity with good safety margin. 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%

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

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Sequential Long-Tail Navigation

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FAQ

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 6-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.

How much effective storage does 6x 8TB RAID-Z2 provide?

For UK homelab buyers, this NAS planning scenario estimates 28.80 TB usable after a 10% reserve from 48.00 TB raw.

How many disk failures can RAID-Z2 tolerate in this setup?

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