IBM DS3200 Storage Subsystem manual L001

is optimal (no overheating has occurred, all electrical receptacles are working, and so on). For more information, see “Restoring power after an unexpected shutdown” on page 57.

If both power supplies fail or if the power supplies cannot maintain an internal temperature below 70°C (158°F), the power supplies in the storage subsystem will automatically shut down (an overtemperature condition). If this occurs, you must cool the storage subsystem and restart it. See “Restoring power after an unexpected shutdown” on page 57.

Attention: The fans in the power-supply units draw in fresh air and force out hot air. The power-supply units are hot-swappable and redundant; however, if the fans in one power-supply unit fail, you must replace the entire failed power-supply unit within 72 hours to maintain redundancy and optimum cooling. Do not remove the failed power-supply unit until you have the replacement power-supply unit. When you do remove the failed power-supply unit, be sure to install the second power-supply unit within 10 minutes to prevent any overheating due to the interruption to the air flow that cools the storage subsystem.

Do not run the storage subsystem without adequate ventilation and cooling, because it might cause damage to the internal components and circuitry.

To replace a power-supply unit, complete the following steps. Figure 48 on page 86 illustrates removing and inserting a unit.

Attention: To prevent damage to the storage subsystem components from overheating, replace a failed power-supply unit within 10 minutes of removal. If replacing it will take longer than 10 minutes, stop all I/O activity to the storage subsystem and turn off the power until you complete the replacement.

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1.If necessary, use the DS3000 Storage Manager software to print a storage system profile.

2.Read the safety information that begins on page xi and “Best practices guidelines” on page 6.

3.Did the Recovery Guru direct you to replace a failed power supply? v Yes: Go to step 4.

vNo: Run the Recovery Guru to identify the failed component, and then go to step 4.

4.Unpack the new power-supply unit. Save all packing material in case you have to return the failed power-supply unit.

Note: The new power-supply unit comes with an instruction sheet and label sheet. The instruction sheet provides instructions for placing the correct

Chapter 5. Replacing components 83