Configure UPS for Synology NAS Safe Shutdown
How to Properly Configure Your UPS With Synology NAS for Safe Shutdowns
Buying a UPS for your Synology NAS is an important first step, but configuration is what truly protects your data. Many users plug their NAS into a UPS and assume they are safe. Without proper DSM configuration, the system may continue running until the battery drains completely, resulting in an abrupt shutdown. That defeats the purpose of investing in power protection.
A properly configured UPS Synology setup ensures your NAS detects power loss, waits a defined amount of time, and then shuts down safely before the battery is exhausted.
Why Safe Shutdown Matters
A Synology NAS constantly performs disk operations, manages RAID arrays, and may even run virtual machines or containers. An unexpected power loss can interrupt active writes and leave volumes in an inconsistent state.
Risks of improper shutdown include:
File system corruption
RAID rebuild events
Lost in-progress data
Reduced drive lifespan
A UPS alone does not prevent these risks. Safe shutdown configuration does.
Step 1: Connect and Verify UPS Detection
Start by plugging your NAS into the battery-backed outlets of the UPS. Many models include both surge-only and battery-backed ports, and it is critical to use the correct ones.
Next, connect the UPS to the NAS using a USB cable. Most APC and compatible UPS units are automatically detected by DSM. You can confirm this by navigating to:
Control Panel → Hardware & Power → UPS
If the UPS is properly connected, DSM will display its status and battery level.
Step 2: Enable UPS Support in DSM
Once detection is confirmed, enable UPS support within DSM. This allows the NAS to monitor battery status and react to outages.
You will typically configure:
Shutdown after a defined time on battery
Or shutdown when battery level becomes low
Most environments benefit from a time-based shutdown, such as five to ten minutes after power loss. This prevents unnecessary shutdowns during short power flickers while still protecting against extended outages.
When the threshold is reached, DSM performs a controlled shutdown. Services stop cleanly, volumes unmount properly, and RAID arrays remain stable.
Step 3: Configure Network UPS (If Multiple NAS Units Exist)
In environments with more than one Synology NAS, you can enable Network UPS Server mode. This allows one UPS-connected NAS to notify additional NAS devices on the same network to shut down safely.
To do this:
Enable Network UPS Server in DSM
Add the IP addresses of other NAS devices
Confirm communication between systems
This configuration is common in rack deployments or offices with separate primary and backup NAS units.
Step 4: Test Your UPS Configuration
Configuration without testing can lead to surprises during a real outage. After setup, perform a controlled test.
Unplug the UPS from wall power while leaving the NAS connected. Observe DSM notifications and confirm that shutdown occurs after your configured delay. Once powered down, restore electricity and verify normal startup.
Testing ensures your safe shutdown NAS configuration works before an actual emergency.
UPS Battery Maintenance and Health
UPS batteries degrade over time. Most units require battery replacement every three to five years depending on usage and environmental conditions.
To maintain reliability:
Run periodic battery self-tests
Monitor battery capacity warnings in DSM
Keep the UPS in a ventilated area
Replace aging batteries proactively
Ignoring battery health can result in insufficient runtime during an outage, preventing safe shutdown.
Choosing the Right UPS for Synology
Not all UPS models are equal. Your unit should support USB communication so DSM can monitor it. It must provide enough capacity for your NAS and any connected switches or routers. Most small NAS environments require modest capacity, since the goal is safe shutdown rather than long-term runtime.
Compatibility with Synology DSM is essential. APC models are commonly used and integrate reliably, but other supported brands also work effectively.
Common Mistakes to Avoid
Even experienced users make configuration errors. The most common include:
Plugging the NAS into surge-only outlets
Not enabling UPS support in DSM
Setting shutdown delay too long
Never testing the shutdown process
Ignoring battery replacement alerts
These mistakes can create false confidence in your power protection strategy.
About Epis Technology
Epis Technology helps organizations design and configure complete UPS protection strategies for Synology NAS environments. We ensure proper shutdown timing, network UPS configuration, and battery lifecycle management. By combining hardware selection with correct DSM configuration, Epis Technology protects business-critical storage systems from unexpected power disruptions.