NAS pSEO Landing
Region Focus · APAC
Estimate usable TB, parity, and fault tolerance for APAC homelab buyers using 4x 12TB in RAID 5.
Raw Capacity
48.00 TB
Usable Capacity
32.40 TB
Fault Tolerance
1 drive
Efficiency
75.0%
Balanced capacity and redundancy, but rebuild stress can be high on large disks. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 32.40 TB | 1 drive | 75.0% |
| RAID 6 | 21.60 TB | 2 drives | 50.0% |
| RAID 10 | 21.60 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 32.40 TB | 1 drive | 75.0% |
| RAID-Z2 | 21.60 TB | 2 drives | 50.0% |
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.
This setup can tolerate 1 drive. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
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.
For APAC homelab buyers, this NAS planning scenario estimates 32.40 TB usable after a 10% reserve from 48.00 TB raw.