IBM DS4800 - RAID Controller Needs Attention and Service Action Allowed Leds

3. Is the Service Action Allowed status LED turned on? (Figure 83 shows the
location of the Service Action Allowed status LED on the back of a controller.)
v Yes – Go to step 4.
v No – Another component requires attention before you can remove the
controller. Normally, this situation indicates that a power supply-fan is either
powered off or failed. Ensure that both power supply-fans are powered on
and in an optimal state. If the Service Action Allowed status LED of the
failed controller is unlit and both power supply-fans are in an optimal state,
contact your IBM support representative.
Electrostatic discharge can damage sensitive components. Touching the
storage subsystem or its components without using a proper ground might
damage the equipment. To avoid damage, use proper antistatic protection
while handling any components.
4. Put on antistatic protection.
5. Unpack the new controller. Save all packing materials in the event you need to
return the new controller.
6. Determine whether the replacement controller will serve as Controller A or
Controller B (Controller A is inserted in the top controller bay; Controller B is
inserted in the bottom controller bay), and then apply the controller labels for
host channels, drive channels, power inputs, and numeric display to the
replacement controller. The controller labels and instructions are included with
the replacement controller. Make sure that the labels are aligned properly and
do not cover any ports or LEDs.
Attention: Handle and install fiber-optic cables properly to avoid degraded
performance or loss of communications with devices. When working with
fiber-optic cables, do not pinch them, step on them, or locate them in aisles or
walkways. Do not overtighten the cable straps or bend the cables to a radius
smaller than 38 mm (1.5 in.).
7. Disconnect all attached interface cables from the failed controller, including the
SFP modules. Ensure that you label each cable so that you can reconnect
them correctly to the new controller. Figure 84 on page 139 shows the location
of the connectors on the back of a controller.
76037
Needs Attention
LED (amber)
Service Action
Allowed LED (blue)
Needs Attention
LED (amber)
Service Action
Allowed LED (blue)
Controller A
Controller B
ds48048
Figure 83. RAID controller Needs Attention and Service Action Allowed LEDs
138 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide