UK 8x 8TB RAID-Z1 NAS Calculator

Estimate usable TB, parity, and fault tolerance for UK homelab buyers using 8x 8TB in RAID-Z1.

Capacity Snapshot

Raw Capacity

64.00 TB

Usable Capacity

50.40 TB

Fault Tolerance

1 drive

Efficiency

87.5%

ZFS single-parity equivalent of RAID 5; common for smaller homelab pools. This scenario applies a 10% filesystem reserve.

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Alternative Mode Comparison

Mode	Usable	Tolerance	Efficiency
RAID 5	50.40 TB	1 drive	87.5%
RAID 6	43.20 TB	2 drives	75.0%
RAID 10	28.80 TB	1 drive per mirror pair*	50.0%
RAID-Z1	50.40 TB	1 drive	87.5%
RAID-Z2	43.20 TB	2 drives	75.0%

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

Is RAID-Z1 still practical with 8TB 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 capacity?

Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.

How much usable storage does 8x 8TB RAID-Z1 provide?

For UK homelab buyers, this NAS planning scenario estimates 50.40 TB usable after a 10% reserve from 64.00 TB raw.

Should I optimize this 8-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.