NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 10x 18TB in RAID 1. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
180.00 TB
Usable Capacity
16.20 TB
Fault Tolerance
9 drives*
Efficiency
10.0%
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 | 145.80 TB | 1 drive | 90.0% |
| RAID 6 | 129.60 TB | 2 drives | 80.0% |
| RAID 10 | 81.00 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 145.80 TB | 1 drive | 90.0% |
| RAID-Z2 | 129.60 TB | 2 drives | 80.0% |
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.
This NAS planning scenario estimates 16.20 TB usable after a 10% reserve from 180.00 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 9 drives*. Real-world survivability depends on mirror placement, rebuild stress, and drive health.