MTTR — Mean Time To Repair
Definition
The average time required to repair a failed component and restore service.
Context & Usage
MTTR depends on detection time (monitoring), parts availability (warranty / spare-parts inventory), and procedure complexity. Typical MTTR: hot-swappable drives ~5 minutes, hot-swappable PSU ~10 minutes, motherboard replacement ~2 hours. Lower MTTR = higher overall system availability.
Examples
- Hot-swap drive: MTTR ~5 min
- Cold motherboard swap: MTTR ~2-4 hr
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