IBM System Storage DS3300 Installation, User's, And Maintenance Manual page 76

v An unusually high room temperature
v Fan failures in the power-supply units
v Defective circuitry in a power supply
v Blocked air vents
v Failures in other devices in the configuration or rack cabinet
If a fan failure causes overheating, the system-error LED and overtemperature
LEDs on the storage subsystem are lit. The fault LED on the power supply might
also be lit. "Checking the LEDs" on page 49 shows the location of the LEDs on the
DS3300.
If the storage subsystem temperature exceeds 45°C (113°F), the storage
management software displays a Needs Attention icon in the Subsystem
Management window. If the air temperature inside the rack cabinet reaches 65°C
(149°F), the power supplies automatically shut down. If event monitoring is enabled
and event notification is configured, the software issues two critical-problem
notifications.
v If one power supply shuts down, the storage management software displays a
v If both power supplies shut down, the storage subsystem shuts down, and the
To resume normal operation after a power-supply shutdown, complete the following
steps:
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System Storage DS3300 Storage Subsystem: Installation, User's, and Maintenance Guide
Needs Attention status in the Subsystem Management window.
storage management software displays a Not Responding status in the Array
Management window.
Attention: To prevent damage to the DS3300 storage subsystem components
when the power supplies automatically shut down, immediately remove all rack
cabinet panels to help reduce the rack cabinet air temperature.
1. Did you use the procedure "Troubleshooting the storage subsystem" on page
48 to identify an overheating problem?
v Yes: Go to step 2.
v No: Perform the procedure in "Troubleshooting the storage subsystem" on
page 48 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 expansion
enclosures.
3. Take all or some of the following measures to alleviate the overheating
problem:
v Remove all panels from the rack cabinet immediately.
v Use external fans to cool the area.
v Shut down the power to the storage expansion enclosure, using the
procedure that is described in "Performing an emergency shutdown" on
page 56.
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.