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5x 14TB RAID-Z1 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 5x 14TB in RAID-Z1. Includes reserve planning for NAS and homelab arrays.

Capacity Snapshot

Raw Capacity

70.00 TB

Usable Capacity

50.40 TB

Fault Tolerance

1 drive

Efficiency

80.0%

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 80.0%
RAID 6 37.80 TB 2 drives 60.0%
RAID 10 N/A N/A N/A
RAID-Z1 50.40 TB 1 drive 80.0%
RAID-Z2 37.80 TB 2 drives 60.0%

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

← Previous: 5x 14TB RAID 6 NAS Calculator | Usable TB Next: 5x 14TB RAID-Z2 NAS Calculator | Usable TB →

FAQ

How much real-world usable storage does 5x 14TB RAID-Z1 provide?

This NAS planning scenario estimates 50.40 TB usable after a 10% reserve from 70.00 TB raw.

How many disk failures can RAID-Z1 tolerate in this setup?

This setup can tolerate 1 drive. Real-world survivability depends on mirror placement, rebuild stress, and drive health.

Should I optimize this 5-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.

Is RAID-Z1 still practical with 14TB drives?

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