NAS pSEO Landing
Region Focus · APAC
Estimate usable TB, parity, and fault tolerance for APAC homelab buyers using 10x 12TB in RAID-Z2.
Raw Capacity
120.00 TB
Usable Capacity
86.40 TB
Fault Tolerance
2 drives
Efficiency
80.0%
Popular TrueNAS default for medium arrays; dual-parity with good safety margin. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 97.20 TB | 1 drive | 90.0% |
| RAID 6 | 86.40 TB | 2 drives | 80.0% |
| RAID 10 | 54.00 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 97.20 TB | 1 drive | 90.0% |
| RAID-Z2 | 86.40 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.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.
For APAC homelab buyers, this NAS planning scenario estimates 86.40 TB usable after a 10% reserve from 120.00 TB raw.
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.