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If the internal temperature reaches 65° C (149° F), the power supply shuts down
automatically. If both power supplies shut down because of overheating, the module
has no power, and all indicator lights are off.
The following factors can cause the power supplies to overheat.
v An unusually high room temperature
v Fan failures in the power supply and fan units
v Defective circuitry in the power supply
v Blocked air vents
v Failures in other devices in the configuration or cabinet
If a fan failure causes overheating, the Global Fault LED on the storage expansion
enclosure turns on. The power-fan canister Fault LED on the back of the storage
expansion enclosure also turns on. "Controller LEDs" on page 91 shows the
location of these LEDs.
If the module temperature exceeds 45° C (113° F), the storage management
software displays a Needs Attention icon in the Subsystem Management window. If
event monitoring is enabled, and event notification is configured, the software
issues the following two critical problem notifications.
v If one power supply shuts down, the storage management software displays a
Needs Attention status in the Subsystem Management window.
v If both power supplies shut down, the module shuts down, and the storage
management software displays a Not Responding status in the Array
Management window.
Use the following procedure to resume normal operation after a power supply
shutdown.
Attention:
Risk of damage from overheating - The power supplies
automatically shut down when the air temperature inside the cabinet reaches 65°
C (149° F). If the power supplies shut down, immediately remove all cabinet
panels to help cool the cabinet air temperature and to prevent damage to the
DS4000 storage subsystem configuration components.
1. Remove the front cover.
2. If applicable, mute the alarm.
3. Did you use the procedure "Troubleshooting the storage subsystem " on page
87 to identify an overheating problem?
v Yes - Go to step 4.
v No - Perform the procedure "Troubleshooting the storage subsystem " on
page 87 to verify that the power supplies have shut down because of an
overheating problem, and then go to step 4.
4. Stop I/O activity to the storage subsystem and all attached storage expansion
enclosures.
5. Take all or some of the following measures to alleviate the overheating
problem:
v Removing all panels from the cabinet immediately
v Using external fans to cool the area
v Shutting down the power to the storage expansion enclosure, using the
procedure described in "Performing an emergency shutdown" on page 97
6. Wait for the air temperature in and around the storage subsystem to cool.
After the temperature inside the power supplies cools to below 65° C (149° F),
the storage subsystem is capable of power-up recovery without operator
Chapter 4. Operating the storage subsystem
99
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