EU 6x 8TB RAID-Z1 NAS Calculator

Estimate usable TB, parity, and fault tolerance for EU homelab buyers using 6x 8TB in RAID-Z1.

Capacity Snapshot

Raw Capacity

48.00 TB

Usable Capacity

36.00 TB

Fault Tolerance

1 drive

Efficiency

83.3%

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

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%

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.

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 36.00 TB usable after a 10% reserve from 48.00 TB raw.

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