EU 8x 8TB RAID 6 NAS Calculator

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

Capacity Snapshot

Raw Capacity

64.00 TB

Usable Capacity

43.20 TB

Fault Tolerance

2 drives

Efficiency

75.0%

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

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%

EU deployments often place additional emphasis on energy efficiency and predictable lifecycle upgrades, especially for always-on NAS fleets.

• Choose a layout that minimizes emergency rebuild risk under continuous operation.
• Prefer capacity plans that survive one upgrade cycle without pool redesign.

Capacity and reliability strategy across multiple hardware refresh cycles.

Intentional free-space margin to protect performance and snapshot behavior.

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

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

For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.

For EU homelab buyers, this NAS planning scenario estimates 43.20 TB usable after a 10% reserve from 64.00 TB raw.