NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 6x 10TB in RAID 6. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
60.00 TB
Usable Capacity
36.00 TB
Fault Tolerance
2 drives
Efficiency
66.7%
Safer for larger arrays with dual parity, at the cost of one extra parity disk. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 45.00 TB | 1 drive | 83.3% |
| RAID 6 | 36.00 TB | 2 drives | 66.7% |
| RAID 10 | 27.00 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 45.00 TB | 1 drive | 83.3% |
| RAID-Z2 | 36.00 TB | 2 drives | 66.7% |
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
This setup can tolerate 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.