# Synology SHR-1 vs SHR-2: One or Two Drive Redundancy?

Canonical: https://cloudzat.com/synology-shr-1-vs-shr-2/
Full Markdown: https://cloudzat.com/synology-shr-1-vs-shr-2/index.md
Cluster context: https://cloudzat.com/ai/synology-technical/context.json

Purpose: Compare SHR-1 and SHR-2 for one-drive vs two-drive fault tolerance, usable capacity, bay count, rebuild exposure and long-term NAS growth.
Direct answer: Four or more large drives, long rebuild times and business-critical availability can make SHR-2 attractive. Smaller home arrays with strong external backup may get more usable capacity from SHR-1 while still maintaining one-drive tolerance.

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