Expansion

In the Expansion page, you can see the graphic representing your Synology NAS and the connected expansion units, allowing you to immediately view the connection status between the devices. Synology NAS can connect up to two expansion units via SAS cables.

To view the connection status

Once your Synology NAS is connected to an expansion unit via SAS cables, go to Expansion > Expansion Overview to view the connection status.

The Out label: This label indicates that a SAS cable is connected from one device (e.g., the unified controller) to another device (e.g., an expansion unit).
The In label: This label indicates that a SAS cable is connected to a device (e.g., an expansion unit) from another device (e.g., the unified controller).
No Expansions: This message is shown if no expansion unit is connected to your Synology NAS.
A message will appear on the graphic if connection issues occur.

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