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Knowledge Center

UPS

An UPS (Uninterruptible Power Supply) is a backup power device that allows the Synology NAS to continue operating for a short time if power failure occurs. This function located at Control Panel > Hardware & Power > UPS helps prevent data loss by giving the Synology NAS enough time to save data and unmount volumes before losing power and shutting down.

Standby Mode

When the Synology NAS enters Standby Mode, it stops all services and unmounts volumes in order to prevent data loss and shut down safely when the UPS device runs out of power. By default, the system enters Standby Mode when the UPS device starts running low on power. You can also specify the amount of time before the Synology NAS enters Standby Mode when power failure occurs. However, if the UPS device reaches low battery before the specified time, the system enters Standby Mode immediately.

In situations where the Synology NAS shuts down during Standby Mode, it will automatically turn on when power is restored if you have enabled the Restart automatically after a power failure option (located at Control Panel > Hardware & Power > General).

USB UPS Support

A USB UPS is a backup power device that connects to your Synology NAS via a USB port. For information regarding hardware installation, please consult the user manual of your UPS device. Once installation is complete, and the Synology NAS has been plugged into the UPS device, you can follow the steps below to enable UPS support.

To enable USB UPS support:

  1. Connect the USB UPS device to a USB port of the Synology NAS.
  2. On the UPS tab, tick the Enable UPS support checkbox.
  3. Select USB UPS from the UPS type drop-down menu.
  4. Under Time before Synology NAS enters Standby Mode, select when the Synology NAS should enter Standby Mode upon power failure.
    • Until low battery: When the UPS is low on battery, the Synology NAS will automatically enter Standby Mode.
    • Customize time: You can specify when the Synology NAS should enter Standby Mode upon power failure. Enter a numeric value and select second(s), minute(s), or hour(s) from the drop-down menu.

      • Note: Regardless of which option is selected, Synology NAS will automatically enter Standby Mode when it is low on power.

  5. If you wish to shut down the UPS when the system enters Standby Mode, tick Shut down UPS when the system enters Standby Mode.
    • If this option is enabled, the Synology NAS will be shut down immediately upon the loss of power source.
    • If this option is enabled, please make sure to tick Restart automatically after a power failure in Control Panel > Hardware & Power > General to ensure that the Synology NAS will automatically restart once the power is restored.
    • The UPS power-off function varies by brand and model. Some UPS devices do not support shutting down by DSM. Before using the UPS in production environment, please conduct a power outage simulation test to determine if the UPS performs as expected. To conduct the test, tick Shut down UPS when the system enters Standby Mode, click Apply, and manually remove the power cable of the UPS.
  6. Tick Enable network UPS server if this Synology NAS is connected to a USB UPS and will act as a network UPS server. Click Permitted Synology NAS Devices to enter the IP addresses of all Synology NAS devices you will allow to connect to this UPS.
  7. Click Device Information for detailed information about the USB UPS device.
  8. Click Apply.

SNMP UPS Support

A SNMP UPS is a backup power device that connects to your Synology NAS through SNMP. For information regarding hardware installation, please consult the user manual of your SNMP UPS device. Once the Synology NAS has been plugged into the device and connected to the same network, you can follow the steps below to enable UPS support.

To enable SNMP UPS support:

  1. On the UPS tab, tick the Enable UPS support checkbox.
  2. Select SNMP UPS from the UPS type drop-down menu.
  3. Under Time before Synology NAS enters Standby Mode, select when the Synology NAS should enter Standby Mode upon power failure.
    • Until low battery: When the UPS is low on battery, the Synology NAS will automatically enter Standby Mode.
    • Customize time: You can specify when the Synology NAS should enter Standby Mode upon power failure. Enter a numeric value and select second(s), minute(s), or hour(s) from the drop-down menu.

      • Note: Regardless of which option is selected, Synology NAS will automatically enter Standby Mode when it is low on power.

  4. In the SNMP UPS IP address field, enter the IP address of the SNMP UPS device.
  5. Select the SNMP MIB from the drop-down menu.
  6. Select the SNMP version from the drop-down menu.
  7. Enter the community string for the SNMP UPS device into the SNMP community field.
  8. Tick Enable network UPS server if this Synology NAS is connected through SNMP and will act as a network UPS server. Click Permitted Synology NAS Devices to enter the IP addresses of all Synology NAS devices you will allow to connect to this UPS.
  9. Click Apply.

Note:

  • It is strongly recommended to use SNMP UPS for Synology High Availability (SHA) deployments.
  • Synology NAS supports SNMPv1, SNMPv2c, and SNMPv3 UPS devices.

Synology UPS server

If there are multiple Synology products using a UPS device with one Synology product connected to the UPS device through a USB port or network, only the Synology NAS connected via USB or network can obtain information regarding the status of the UPS device. In this case, this Synology NAS will act as a "network UPS server". The network UPS server then receives UPS information and relays it to the client Synology NAS.

To enable Synology UPS server:

  1. Log into the Synology NAS that is connected to the UPS device (via USB or network).
  2. On the UPS tab, tick the Enable network UPS server checkbox to allow the Synology NAS to relay UPS information to the client Synology NAS.
  3. Click the Permitted Synology NAS Devices button.
  4. On the window that appears, enter the IP addresses of the client Synology NAS. Click OK.
  5. Click Apply to save settings.

Now the network UPS server can obtain UPS information and relay it to the client Synology NAS that is using the UPS device. Please see the instructions below to enable UPS support on the client Synology NAS.

To enable UPS support on the client Synology NAS:

  1. Log into the client Synology NAS that is using the UPS device, but not connected via USB or network.
  2. On the UPS tab, tick the Enable UPS support checkbox.
  3. Select Synology UPS server from the UPS type drop-down menu.
  4. Under Time before Synology NAS enters Standby Mode, select when the Synology NAS should enter Standby Mode upon power failure.
    • Same as server: This option will shut down the Synology products when the server is shut down.
    • Customize time: You can specify when the Synology NAS should enter Standby Mode upon power failure. Enter a numeric value and select second(s), minute(s), or hour(s) from the drop-down menu.

      • Note: Regardless of which option is selected, Synology NAS will automatically enter Standby Mode when it is low on power.

  5. Enter the IP address of the network UPS server in the Network UPS server IP field.
  6. Click Apply to save settings.

Network UPS Requirements:

  • To relay UPS device information, all Synology NAS should be connected to the same network.
  • The network device (e.g. switch or hub) to which each Synology NAS is connected should be plugged into the same UPS device. Otherwise the Synology NASs will not be able to relay UPS device information when power failure occurs.
USB UPS Support
SNMP UPS Support
Synology UPS server