IBM DS3200 Storage Subsystem manual Recovering from an overheated power supply

vYes: Do not continue with this procedure. Contact your IBM technical-support representative for assistance. Depending on the current service agreements, you might have to return the equipment to the factory or local service center for repair.

vNo: Go to step 2.

Attention: To avoid potential data loss, make sure that the storage subsystem and storage expansion enclosure power switches are turned off before you reset circuit breakers in the rack cabinet. Resetting circuit breakers after an emergency situation while the storage subsystem and storage expansion enclosure power switches are turned on can cause data loss, because the configuration components might not be powered-on in the correct sequence. See “Turning on the storage subsystem” on page 46 for details about the correct power-on sequence.

2.After you check the storage subsystem for damage, make sure that the power switches are off; then connect the DS3200 power cables, if required.

3.Check the system documentation of the hardware devices that you want to turn on and determine the correct startup sequence.

Be sure to turn on all of the storage expansion enclosures and make sure that no ESM or power-supply fault LEDs are lit before you turn on the DS3200.

In addition, consider the following items:

vThe storage subsystem supports simultaneous power-on of the system components; however, always follow the power-on sequence that is described in the “Turning on the storage enclosure" section of the applicable Installation, User’s, and Maintenance Guide during any attended power-on procedure.

vA storage subsystem in an optimal state recovers automatically from an unexpected shutdown and unattended simultaneous restoration of power to system components. After power is restored, contact your IBM technical-support representative if any of the following conditions occur:

–The storage subsystem logical drives and subsystems are not displayed in the Storage Manager graphical user interface.

–The storage subsystem logical drives and subsystems do not come online.

–The storage subsystem logical drives and subsystems seem to be degraded.

4.Turn on the power to each device, according to the startup sequence.

5.Turn on both of the power-supply switches on the DS3200. The green LEDs on the front and the rear of the DS3200 should remain lit. If other amber LEDs are lit, see Chapter 6, “Solving problems,” on page 99.

Recovering from an overheated power supply

Each storage subsystem contains two power supplies. Each power supply contains a built-in temperature sensor to prevent the power supply from overheating. Under normal operating conditions, with an ambient air temperature range of 10°C to 35°C (50°F to 95°F), the fans in the power-supply units maintain a suitable operating temperature inside the module.

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 storage subsystem has no power, and all LEDs are off.

The following factors can cause the power supplies to overheat:

58System Storage DS3200 Storage Subsystem: Installation, User’s, and Maintenance Guide