Power Supply-Fan Needs Attention Leds - IBM DS4800 User, Installation And Maintenance Manual

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.
1. If the alarm is sounding, turn off the alarm.
2. Check to ensure that the external power cables are completely plugged into
the controllers and into the power source.
3. Put on antistatic protection.
4. Remove the front bezel by grasping the sides and pulling the cover toward
you.
5. Check the Needs Attention LED on each power supply-fan. (Figure 76 shows
the location of the Needs Attention LEDs.)
Left power supply-fan unit
Service Action
Allowed LED
Needs Attention LED
Figure 76. Power supply-fan Needs Attention LEDs
Is a power supply-fan Needs Attention LED on?
v Yes – A power supply-fan has failed. To replace the failed power supply-fan,
see "Replacing a power supply-fan" on page 144.
v No – Go to step 6 on page 126.
Attention: Fiber-optic cables are fragile. Bending, twisting, folding, or
pinching fiber optic cables can cause damage to the cables, degraded
performance, or data loss. To prevent damage, do not twist, fold, pinch, or step
on the cables. Do not bend the cables in less than a 2-inch radius.
Note: You do not need to remove the interface cables from the controllers to
reset the circuit breakers; however, IBM recommends that you remove
the cables to make this procedure easier. If you choose to remove the
interface cables, ensure that you label each cable so that you can
reconnect them correctly to the controller. Figure 77 on page 126
identifies all of the connectors on the back of the controller.
Right power supply-fan unit
Needs Attention LED
Service Action
Allowed LED
Chapter 4. Operating the storage subsystem
125