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Turning on the memory expansion module
The memory expansion module is controlled by the server. Turning on the memory
expansion module refers to connecting the memory expansion module power cord
to the power source and pressing the power-control button on the host server. The
host server must be connected to the memory expansion module and configured to
identify the memory expansion module. Normally, when the operating system on
the server starts, the server issues a power-on request to the memory expansion
module.
Turning off the memory expansion module
The memory expansion module is turned off only if the connected server issues a
power-off request and you disconnect the memory expansion module power cord
from the power source. You cannot turn off the memory expansion module
manually.
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.
You can disconnect the memory expansion module power cords from the power
source to shut off all power immediately without damaging the memory expansion
module, but it might cause an unrecoverable error and loss of data on the
connected server.
28 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide