NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 12x 6TB in RAID 1. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
72.00 TB
Usable Capacity
5.40 TB
Fault Tolerance
11 drives*
Efficiency
8.3%
Strong redundancy but low capacity efficiency. Great for small, critical datasets. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 59.40 TB | 1 drive | 91.7% |
| RAID 6 | 54.00 TB | 2 drives | 83.3% |
| RAID 10 | 32.40 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 59.40 TB | 1 drive | 91.7% |
| RAID-Z2 | 54.00 TB | 2 drives | 83.3% |
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 NAS planning scenario estimates 5.40 TB usable after a 10% reserve from 72.00 TB raw.
This setup can tolerate 11 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.