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Instructions in a hardware or software procedure require you to turn off the
power.
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A service technician tells you to turn off the power.
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A planned power outage or emergency situation occurs (see “Performing an
emergency shutdown” on page 136).
Statement 5:
CAUTION:
The power control button on the device and 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.
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2
Attention:
Turning the power off and on without waiting for the storage expansion
enclosure disk drives to spin down, can damage the drives and might cause data
loss. Wait
at least
70 seconds after turning the power off before turning it on, again.
Power-off overview
Review the following information before you continue with the power-off
procedure below.
Turn off the power to each device based on the following shutdown sequence:
1. Turn off power to the host before the storage subsystem. If the host must
stay powered on to support an existing network, see the operating system
documentation for information about disconnecting the storage subsystem
logical drives from the host before the storage subsystem is powered off.
2. Turn off power to the storage subsystem before you turn off power to the
storage expansion enclosures. Turn off both power supply switches on the
back of the storage subsystem.
3. Turn off power to other supporting devices (for example, management
stations, fibre-channel switches, or Ethernet switches).
Note:
You do not need to perform this step if you are servicing only the
storage subsystem.
Use the following procedure to turn off power to one or more storage subsystems
for a planned shutdown. To turn off power for an unplanned shutdown, see
“Performing an emergency shutdown” on page 136.
Before proceeding, use the DS Storage Manager client to determine the status of
the system components and special instructions. The operating system software
might require you to perform other procedures before you turn off the power.
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IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide