Check Real CPU Temperature via CLI on Synology DSM 7.2.1

# Check Real CPU Temperature via CLI on Synology DSM 7.2.1 ## 📋 Video Overview This tutorial provides a comprehensive guide on how to check the real CPU temperature on Synology NAS (DSM 7.2.1) using command-line tools. Since the temperature displayed in Synology's Info Center may not always be accurate, using command-line utilities enables more precise temperature monitoring, which is crucial for NAS system maintenance and health monitoring. --- ## 🎯 Core Content ### Why Use Command Line for Temperature Monitoring? While Synology NAS provides temperature display in the Info Center, the readings can be inaccurate in certain situations. Command-line tools offer: - Accurate real-time CPU temperature data - Individual core temperature readings - CPU temperature thresholds (high and critical temperatures) - Real-time temperature monitoring capabilities ### Detailed Installation Steps **Prerequisites:** - Logged into NAS system - Switched to root account (refer to author's previous videos for details) **Installation Process:** 1. **Create Working Directory** ```bash cd /volume1/temp mkdir lm cd lm ``` 2. **Download Installation Package** - Download signal-related installation file (specific filename provided in video) - Downloaded file appears in white (non-executable state) 3. **Grant Execute Permission** ```bash chmod +x [filename] ``` - File turns green when executable 4. **Install rpkg Package Manager** ```bash sh [installation_file] ``` - rpkg is similar to App Store for package management 5. **Update and Install Temperature Monitoring Tool** ```bash rpkg update rpkg install lm-sensors ``` - "Successful" message indicates successful installation ### Temperature Reading and Interpretation **Basic Command:** Running the temperature tool displays: - **Package ID 0**: Overall CPU temperature (aggregate reading) - **High Temperature**: 105°C (maximum normal operating temperature) - **Critical Temperature**: 105°C (critical threshold, triggers automatic shutdown) - **Core 0/1/2/3**: Individual CPU core temperatures **Temperature Variance Notes:** - Command-line readings are typically more accurate than GUI display - Individual core temperatures are usually slightly lower than overall CPU temperature - Testing showed temperature differences of 7-11°C (varies dynamically) --- ## 🔄 Advanced Tips: Real-Time Temperature Monitoring **Loop Refresh Display (5-second intervals):** ```bash while true; do [temperature_command]; sleep 5; done ``` - Temperature data refreshes every 5 seconds - Press `Ctrl + C` to terminate the loop **Multi-Window Monitoring Strategy:** - Window 1: Real-time CPU temperature monitoring - Window 2: GPU utilization monitoring (using commands from previous videos) - Web Interface: System operations Linux's underlying architecture supports single-user multi-session login, allowing multiple SSH windows for comprehensive system monitoring. --- ## 💡 Practical Value 1. **Hardware Monitoring**: Accurately track CPU temperature to prevent overheating damage 2. **Performance Optimization**: Combined with GPU monitoring to understand temperature changes during hardware transcoding 3. **System Maintenance**: Early detection of cooling issues to extend hardware lifespan 4. **Linux Learning**: Familiarize with command-line operations and low-level system management --- ## 📌 Important Notes - All commands will be provided in a shared document at the end of the video for easy copying - Temperature thresholds may vary across different NAS models - Regular temperature checks recommended, especially during high-load operations - CPU temperature correlates with GPU temperature (in iGPU hardware transcoding scenarios) --- ## 🏷️ SEO Keywords Synology NAS, DSM 7.2.1, CPU Temperature Monitoring, Command Line Tutorial, Linux System Administration, NAS Maintenance, Hardware Monitoring, System Optimization, SSH Operations, rpkg Package Manager --- ## 🔗 Related Topics - Synology NAS system administration - Linux temperature monitoring tools (lm-sensors) - Hardware health monitoring - NAS performance optimization - Command-line system management