IBM DS4800 User, Installation And Maintenance Manual page 145

Attention: Power supplies automatically shut down when air temperature inside
the cabinet reaches 70° C (158° F) or above. If the power supplies have shut down,
immediately remove all cabinet panels to help cool the cabinet air temperature and
prevent damage to the storage subsystem.
Note: If both power supply-fan units have shut down, start with step 4 below.
1. If applicable, turn off the alarm.
2. Use the DS4000 Storage Manager client software to print a storage subsystem
profile.
3. In the DS4000 Storage Manager client Subsystem Management window, select
Advanced Troubleshooting
critical events. Look for one of the following critical event entries:
v Event 281B - Nominal temperature exceeded
v Event 281C- Maximum temperature exceeded
4. Try alleviating the overheating problem by:
v Removing all panels from the cabinet
v Cooling the area using external fans
v Shutting down the power to the storage subsystem or storage expansion
enclosures (Follow the power-down procedure described in "Turning off the
storage subsystem" on page 100.)
5. Stop all I/O activity to the storage subsystem and to all attached storage
expansion enclosures.
6. Wait until the ambient air temperature around the storage subsystem cools.
The storage subsystem is capable of power-up recovery without operator
intervention after the temperature inside the power supply-fan cools to below
70° C (158° F). After the air has cooled, the power supplies should turn on
automatically. If the power supplies restart automatically, the controllers reset
and return to normal operation.
7. Did the power supplies restart automatically?
v Yes – Go to step 9.
v No – Go to step 8.
8. Turn off the power switch on each controller in the storage subsystem and
then power off all connected storage expansion enclosures. Wait 1 minute and
then turn on power to all connected storage expansion enclosures and then to
the storage subsystem. If the power supplies go into operation, go to step 9. If
not, call your IBM service representative.
9. Check the status LEDs on the front and back of the storage subsystem.
For information about storage subsystem LEDs, see "Checking the LEDs" on
page 111.
10. Are the LEDs on the storage subsystem indicating normal status?
v Yes – Go to step 11.
v No – Go to step 12.
11. Use the DS4000 Storage Manager client software to check the status of all
storage subsystems in the configuration. Is the status Optimal for each storage
subsystem?
v Yes – End of procedure. Resume normal operation.
v No – Go to step 12.
12. Diagnose and correct the fault by completing the following steps.
View Event Log to display the DS4800
Chapter 4. Operating the storage subsystem
123