NAS pSEO Landing
Region Focus · UK
Compare usable TB, parity, and failure tolerance between RAID-Z3 and RAID-Z2 for UK homelab setups.
This page compares RAID-Z3 and RAID-Z2 on identical hardware assumptions to help homelab builders choose between capacity efficiency and fault tolerance.
| Drives | RAID-Z3 | RAID-Z2 | Delta |
|---|---|---|---|
| 4x 8TB | N/A | 14.40 TB | N/A |
| 6x 8TB | 21.60 TB | 28.80 TB | -7.20 TB |
| 8x 8TB | 36.00 TB | 43.20 TB | -7.20 TB |
| 10x 8TB | 50.40 TB | 57.60 TB | -7.20 TB |
| 12x 8TB | 64.80 TB | 72.00 TB | -7.20 TB |
UK homelab planners commonly balance higher per-drive pricing with power and chassis constraints, so efficient but resilient layouts become more valuable.
Expected always-on energy usage cost factored into NAS layout decisions.
Estimated time exposure while replacing a failed drive and restoring parity.
The better option is the one that keeps acceptable usable capacity while preserving safety margins during future disk expansions.
Rebuild behavior depends on array width, disk size, and workload pressure. This page focuses on capacity and tolerance; benchmark your actual platform before final choice.
Yes. The comparison table applies a 10% reserve baseline to reflect realistic operating headroom in NAS and homelab environments.
Yes. Similar usable TB does not imply similar failure tolerance or rebuild exposure. Capacity and resiliency should be evaluated together.