Synology SA3200D Synology High Availability SHA User Guide for DSM 7.0 - Page 25

SHA UPS behavior

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Chapter 3: Set Up and Configure an SHA Cluster SHA UPS behavior We recommend using different power supplies for each server in the cluster to set up UPS. You can choose a suitable type of UPS according to the equipment's requirements. If something happens to the power supply, UPS will help prevent the Synology NAS from powering off unexpectedly. If the active server experiences issues with its power supply, the active server will enter Safe Mode once the specified waiting period has been reached. The system will then switch services over to the passive server so that they can run without interruption. If the passive server experiences issues with its power supply, the passive server will enter Safe Mode alone and not affect services on the active server. Once the power issue is resolved, the passive server will automatically restart and return to the cluster to continue synchronizing data. If your environment does not allow for different power supply sources or the connection of different UPS, you can connect any type of UPS to one of the servers. For example, connect either the active server or the passive server to the UPS. If a power supply interruption occurs, the server connected to the UPS will receive the notification of power failure and forward the notification to the server that is not connected to the UPS. The two servers will then both enter Safe Mode until power is recovered. Then, they will automatically restart to continue providing high-availability services. 23

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Chapter 3: Set Up and Configure an SHA Cluster
SHA UPS behavior
We recommend using different power supplies for each server in the cluster to set up UPS. You
can choose a suitable type of UPS according to the equipment’s requirements. If something
happens to the power supply, UPS will help prevent the Synology NAS from powering off
unexpectedly.
If the
active
server experiences issues with its power supply, the active server will enter
Safe
Mode
once the specified waiting period has been reached. The system will then switch services
over to the passive server so that they can run without interruption.
If the
passive
server experiences issues with its power supply, the passive server will enter
Safe Mode
alone and not affect services on the active server. Once the power issue is resolved,
the passive server will automatically restart and return to the cluster to continue synchronizing
data.
If your environment does not allow for different power supply sources or the connection of
different UPS, you can connect any type of UPS to one of the servers. For example, connect
either the active server or the passive server to the UPS. If a power supply interruption occurs,
the server connected to the UPS will receive the notification of power failure and forward the
notification to the server that is not connected to the UPS. The two servers will then both enter
Safe Mode until power is recovered. Then, they will automatically restart to continue providing
high-availability services.