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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.
(L001)
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.
v No: 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