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 88 shows the location of the LEDs on the
DS3500.
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 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
Needs Attention status in the Subsystem Management window.
v If both power supplies shut down, the storage subsystem shuts down, and the
storage management software displays a Not Responding status in the
Subsystem Management window.
Attention: To prevent damage to the storage subsystem components when the
power supplies automatically shut down, immediately remove all rack panels to
help reduce the rack air temperature.
To resume normal operation after a power-supply shutdown, complete the
following steps:
1. Did you use the procedure “Troubleshooting the storage subsystem” on page
87 to identify an overheating problem?
v Yes: Go to step 2.
v No: Perform the procedure in “Troubleshooting the storage subsystem” on
page 87 to ensure 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 98.
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 on page 101.
v No: Go to step 6.
6. Turn off both power switches on the DS3500 (see Figure 75 on page 84) 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.
100 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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