NAS pSEO Landing
Region Focus · APAC
Estimate usable TB, parity, and fault tolerance for APAC homelab buyers using 10x 20TB in RAID 6.
Raw Capacity
200.00 TB
Usable Capacity
144.00 TB
Fault Tolerance
2 drives
Efficiency
80.0%
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 | 162.00 TB | 1 drive | 90.0% |
| RAID 6 | 144.00 TB | 2 drives | 80.0% |
| RAID 10 | 90.00 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 162.00 TB | 1 drive | 90.0% |
| RAID-Z2 | 144.00 TB | 2 drives | 80.0% |
APAC builders frequently compare availability windows and procurement variance, which makes robust fallback capacity and staged scaling useful in practice.
Regional differences in disk availability and replacement lead times.
Policy of keeping spare disks available to reduce recovery delay risk.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
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 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
For APAC homelab buyers, this NAS planning scenario estimates 144.00 TB usable after a 10% reserve from 200.00 TB raw.