EU 10x 16TB RAID 5 NAS Calculator

Estimate usable TB, parity, and fault tolerance for EU homelab buyers using 10x 16TB in RAID 5.

Capacity Snapshot

Raw Capacity

160.00 TB

Usable Capacity

129.60 TB

Fault Tolerance

1 drive

Efficiency

90.0%

Balanced capacity and redundancy, but rebuild stress can be high on large disks. This scenario applies a 10% filesystem reserve.

Mode	Usable	Tolerance	Efficiency
RAID 5	129.60 TB	1 drive	90.0%
RAID 6	115.20 TB	2 drives	80.0%
RAID 10	72.00 TB	1 drive per mirror pair*	50.0%
RAID-Z1	129.60 TB	1 drive	90.0%
RAID-Z2	115.20 TB	2 drives	80.0%

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.

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 129.60 TB usable after a 10% reserve from 160.00 TB raw.

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