SHR-2 vs RAID 6 — 6×8 TB

You have 6 drives of 8 TB (48 TB raw) and are deciding between SHR-2 (Synology Hybrid RAID, double redundancy) and RAID 6 (double parity — two drives may fail). The table shows what each choice actually gives you.

MetricSHR-2RAID 6
Usable capacity32 TB32 TB
Redundancy overhead16 TB16 TB
Storage efficiency67%67%
Fault tolerance (drives)22
Minimum drives44

Both give the same usable capacity on this configuration — the decision is about failure behavior, not space.

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