IBM Storwize V7000 Unified Problem Determination Manual page 188

v Power supplies in the server must be with the same power rating or wattage to
v Power supply 1 is the default/primary power supply. If power supply 1 fails,
v You can order an optional power supply for redundancy.
v These power supplies are designed for parallel operation. In the event of a
Statement 5
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current from
the device, ensure that all power cords are disconnected from the power source.
Statement 8
CAUTION:
Never remove the cover on a power supply 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.
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Storwize V7000 Unified: Problem Determination Guide 2073-720
ensure that the server will operate correctly. For example, you cannot mix
750-watt and 900-watt power supplies in the server.
you must replace the power supply immediately.
power-supply failure, the redundant power supply continues to power the
system. The server supports a maximum of two power supplies.