IBM DS3500 Installation, User's, And Maintenance Manual page 113

v No: Perform the procedure in "Troubleshooting the storage subsystem" on page 4-6 to make sure
that the power supplies have shut down because of an overheating problem, and then go to step
2.
2. Stop I/O activity to the storage subsystem and all attached storage enclosures.
3. Take all or some of the following measures to alleviate the overheating problem:
v Remove all panels from the rack immediately.
v Use external fans to cool the area.
v Shut down the power to the storage enclosure, using the procedure that is described in
"Performing an emergency shutdown" on page 4-17.
4. Wait for the air in and around the storage subsystem to cool.
After the temperature inside the power supplies drops to below 65°C (149°F), the storage subsystem
is capable of power-on recovery without operator intervention. After the air has cooled, the power
supplies should turn on automatically. If the power supplies restart automatically, the controllers will
reset and return to normal operation.
5. Did the power supplies restart automatically?
v Yes: Go to step 8.
v No: Go to step 6.
6. Turn off both power switches on the DS3500 (see Figure 4-1 on page 4-3) and then power-off all
connected storage enclosures. Wait 1 minute and then turn on power to all connected storage
enclosures.
While a storage enclosure powers-on, the LEDs on the front and the rear of the enclosure flash
intermittently. Depending on your configuration, the storage enclosure can take between 20 seconds
and several minutes to power-on.
Note: If there are enclosures with dc power supplies in your storage subsystem, make sure that the
-48V disconnect devices are turned on and are working.
7. Turn on both power switches on the rear of the storage subsystem. See Figure 4-1 on page 4-3
A storage subsystem can take 10 seconds to power-on and up to 15 minutes for the battery self-test
to be completed. During this time, the LEDs on the front and the rear of the DS3500 flash
intermittently.
8. Check the LEDs on the front and rear of the storage subsystem and each attached storage enclosure
(a green LED indicates a normal status; an amber LED indicates a hardware fault); then, check the
array status in the Subsystem Management window.
a. Open the Subsystem Management window for the storage array.
b. Click the Summary tab and review the status of the configuration.
The status is either Optimal or Needs Attention.
9. Does each module (controller, power supply, ESM) display green status LEDs only, and is the status
Optimal for each module component?
v Yes: Go to step 11 on page 4-20.
v No: Go to step 10.
10. Diagnose and correct the fault.
a. To run the Recovery Guru, click Recovery Guru in the toolbar in the Subsystem Management
window.
b. Complete the recovery procedure.
If the Recovery Guru directs you to replace a failed component, locate and troubleshoot that
component. See "Checking the LEDs" on page 4-7.
c. When the procedure is completed, select Recheck in the Recovery Guru. This runs the Recovery
Guru again to make sure that the problem is corrected.
d. If the problem remains, contact your IBM technical-support representative.
Chapter 4. Operating the storage subsystem and storage enclosure
4-19