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RAIDZ2 vs RAID 6 — 6×12 TB
You have 6 drives of 12 TB (72 TB raw) and are deciding between RAIDZ2 (ZFS double parity with checksums) and RAID 6 (double parity — two drives may fail). The table shows what each choice actually gives you.
| Metric | RAIDZ2 | RAID 6 |
|---|---|---|
| Usable capacity | 48 TB | 48 TB |
| Redundancy overhead | 24 TB | 24 TB |
| Storage efficiency | 67% | 67% |
| Fault tolerance (drives) | 2 | 2 |
| Minimum drives | 4 | 4 |
Both give the same usable capacity on this configuration — the decision is about failure behavior, not space.
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