The instructions below will guide you through the procedure of shutting down, removing, or resetting a high-availability cluster.
When you wish to shut down a high-availability cluster in order to transport the servers to a new physical location or perform maintenance, but do not wish to remove high-availability cluster configurations, please follow these instructions.
High-availability cluster can also be shut down by manually using the power buttons located on each server.
When you want to turn on the servers again, you should turn on both the active and passive servers at the same time (or within five minutes of each other). If you only turn on one of the servers, it will attempt to power on the other server by broadcasting a Wake-on-LAN message.
When a high-availability cluster is created, the restart after power failure option in Control Panel is automatically enabled. If the servers shut down abnormally due to power failure, they will automatically turn on once power is restored.
When you wish to unbind both servers and remove a high-availability cluster in order to bind a different server, please follow these instructions.
After confirmation, the system removes the high-availability cluster. The status field displays the progress of the removal process. When the high-availability cluster has been successfully removed, you will be directed to the original IP address of the active server. The status of both servers will change to Standalone.
In the event you are unable to access DSM or Synology High Availability, due to a split-brain error or other malfunctions, you can attempt to force the high-availability cluster to unbind by pressing the Reset button located on your servers.
Note: During the procedure of removing a high-availability cluster, there might be some incomplete data write operations. To ensure the completeness of data, please perform data replication based on active server because the passive server might be missing some data updates.