Symptom
Log in to the DeviceManager and choose System > Hardware > Devices. Select a disk enclosure that is marked by an exclamation mark (!), and click 
to display the rear view. On the rear view of the storage device, click the expansion module in the red square. Health Status of the expansion module is Faulty.
The expansion module Alarm indicator on the storage device is steady yellow. Figure Location of the expansion module Alarm indicator on a 2 U smart SAS disk enclosure and 2 U smart NVMe disk enclosure and Figure Location of the expansion module Alarm indicator on a 2 U SAS disk enclosure show the location of the expansion module Alarm indicator.
Figure1 Location of the expansion module Alarm indicator on a 2 U smart SAS disk enclosure and 2 U smart NVMe disk enclosure
Figure1 Location of the expansion module Alarm indicator on a 2 U SAS disk enclosure
Alarm Information
On the Alarms and Events page, click the Current Alarms tab. Alarms related to the expansion module are displayed.
Possible Causes
The expansion module is faulty.
Impact
An expansion module fault may cause the running of only a single link at the backend, which may degrade system performance and system reliability.
Fault Diagnosis
Figure1 Troubleshooting flowchart for an expansion module failure
