IBM Storwize V7000 Unified Problem Determination Manual page 336

Attention: A powered-on enclosure must not have a power supply removed for
more than five minutes because the cooling does not function correctly with an
empty slot. Ensure that you have read and understood all these instructions and
have the replacement available, and unpacked, before you remove the existing
power supply.
Even though many of these components are hot-swappable, they are intended to
be used only when your system is not active (no I/O operations). If your system is
powered on and processing I/O operations, go to the management GUI and follow
the fix procedures. Initiating the replacement actions without the assistance of the
fix procedures can result in loss of data or loss of access to data.
Be careful when you are replacing the hardware components that are located in the
back of the system that you do not inadvertently disturb or remove any cables that
you are not instructed to remove.
Attention: In some instances, it might not be advisable to remove a power supply
unit when a system is performing I/O. For example, the charge in the backup
battery might not be sufficient enough within the partner power-supply unit to
continue operations without causing a loss of access to the data. Wait until the
partner battery is 100% charged before replacing the power supply unit.
Ensure that you are aware of the procedures for handling static-sensitive devices
before you replace the power supply.
About this task
A replacement power supply unit is not shipped with a battery; therefore, transfer
the battery from the existing power supply unit to the replacement unit. To
transfer a battery, go to "Replacing a battery in a Storwize V7000 Gen1 power
supply unit" on page 317.
To replace the power supply, perform the following steps:
Procedure
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Storwize V7000 Unified: Problem Determination Guide 2073-720
1. Read the safety information to which "Preparing to remove and replace parts"
on page 295 refers.
2. Examine the Identify LED that is lit on the front of the enclosure to identify
the correct enclosure.
3. Turn off the power to the power supply unit using the switch at the back.
4. Disconnect the cable retention bracket and the power cord from the power
supply that you are replacing.
5. Remove the power supply unit. Record the orientation of the power supply
unit. Power supply unit 1 is top side up, and power supply unit 2 is inverted.
a. Depress the black locking catch from the side with the colored sticker as
shown in Figure 87 on page 309.