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SHR-1 vs RAID 5 — 4×8 TB
You have 4 drives of 8 TB (32 TB raw) and are deciding between SHR-1 (Synology Hybrid RAID, single redundancy, mixed sizes OK) and RAID 5 (single parity — one drive may fail). The table shows what each choice actually gives you.
| Metric | SHR-1 | RAID 5 |
|---|---|---|
| Usable capacity | 24 TB | 24 TB |
| Redundancy overhead | 8 TB | 8 TB |
| Storage efficiency | 75% | 75% |
| Fault tolerance (drives) | 1 | 1 |
| Minimum drives | 2 | 3 |
Both give the same usable capacity on this configuration — the decision is about failure behavior, not space.
With drives of 8 TB and larger, single-parity rebuilds carry measurable URE risk — check yours in the rebuild calculator.
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Open this exact configuration in the calculator and tweak drives, sizes and levels freely.
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