NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 8x 14TB in RAID 6. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
112.00 TB
Usable Capacity
75.60 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.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 88.20 TB | 1 drive | 87.5% |
| RAID 6 | 75.60 TB | 2 drives | 75.0% |
| RAID 10 | 50.40 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 88.20 TB | 1 drive | 87.5% |
| RAID-Z2 | 75.60 TB | 2 drives | 75.0% |
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
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.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.