Qsan Technology XCubeSAN XS5224D Hardware Manual page 116

Removing the Controller Module
If you see the system health becomes
System Information or the
controller module is encountering an issue or a hardware configuration mismatch (different
memory size or different types of host cards are installed in the same slot number of
different controllers) and need
procedures below to remove problematic controller module and install a healthy one.
Figure 6-1
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CAUTION:
The controller module is heavy and fragile; please use both hands

while installing, removing, or carrying the controller module.
Recommended place for removing the controller module: the system
is in a well secured rack or on a stable surface.
For single controller model, the controller must be installed into slot 1

(the top slot of the system in rear view) and you must install the
dummy controller cage provided for the empty slot to ensure the
proper system cooling.
controller status LED shows solid
to be replaced immediately. You need to follow the
Warning Message of Failed Controller Module in the SANOS UI
Controller Degraded in the SANOS UI Dashboard ->
red color, which means your