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Attention: The fans in the dc power supplies draw in fresh air and force out hot
air. The dc power supplies are hot-swappable and redundant; however, if the fans in
one dc power supply and fan unit fail, you must replace the entire failed dc power
supply and fan unit within 72 hours to maintain redundancy and optimum cooling.
Do not remove the failed dc power supply and fan unit until you have the
replacement dc power supply and fan unit. When you do remove the failed dc
power supply and fan unit, be sure to install the second dc power supply and fan
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.
Use the following procedure to replace a dc power supply and fan unit. Figure 114
on page 168 illustrates removing and inserting a unit.
Attention: Potential damage to a component - To prevent damage from
overheating, replace a failed dc power supply and fan unit CRU within 15 minutes
of removal. If replacing it will take longer than 15 minutes, stop all I/O activity to the
storage subsystem and turn off the power until you complete the replacement.
Statement 8:
CAUTION:
Never remove the cover on a dc power supply and fan unit or any part that
has the following label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
1. If needed, use the DS4000 Storage Manager client software to print a storage
system profile.
2. Did the Recovery Guru direct you to replace a failed dc power supply and fan
unit?
v Yes - Go to step 3.
v No - Run the Recovery Guru to identify the failed component, and then go
to step 3.
3. Put on antistatic protection.
4. Unpack the new dc power supply and fan unit. Save all packing material in
case you need to return the failed dc power supply and fan unit CRU.
Note: The new dc power supply and fan unit CRU comes with an instruction
sheet and label sheet. The instruction sheet provides instructions on
Chapter 5. Replacing components 171