v Defective circuitry in the power supply
v Blocked air vent
v Failure in other devices installed in the cabinet
If the internal temperature rises above 70° C (158° F), one or both power supplies
automatically shut down. If one power supply shuts down, the DS4000 Storage
Manager client software displays a Needs Attention status in the Subsystem
Management window, the alarm sounds (if enabled), and the Overall DS4800
Configuration Needs Attention LED on the front bezel of the storage subsystem
turns on.
If a common environmental stress causes both power supplies to shut down, the
storage subsystem shuts down, and the DS4000 Storage Manager client software
displays a Not Responding status in the Subsystem Management window.
If event monitoring is enabled and event notification is configured, the software also
issues critical event notifications.
v Nominal temperature exceeded – The storage subsystem temperature exceeds
the normal operating range.
v Maximum temperature exceeded – The storage subsystem temperature exceeds
70° C (158° F).
Use the following procedure to resume normal operation after a power supply
shutdown.
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 and 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 View Event Log to display the DS4800
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 doing the following:
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 108.)
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 and fan unit 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.
130 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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