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1. If you have time, stop all I/O activity to the storage subsystem by shutting down
the host or disconnecting the storage subsystem logical drives through the host.
2. Check the LEDs. Make note of any Needs Attention LEDs that are on so you
can correct the problem when you turn on the power again.
3. Turn off all power supply switches, starting with the DS4700 Express storage
subsystem first, and followed by the storage expansion enclosures. Then,
unplug the power cables from the storage subsystem.
CAUTION:
The power switch on the power supply and fan unit does not turn off the
electrical current supplied to the device. The DS4700 Express Storage
Subsystem might also have more than one connection to dc power. To
remove all electrical current from the device, ensure that all dc power
cords are disconnected from the power supply and fan unit dc input
connectors.
Restoring power after an unexpected shutdown
Use the following procedure to restore power to the storage subsystem in a
configuration after an unplanned shutdown.
Risk of severe electrical shock – Never turn on the power to any equipment if
there is evidence of fire, water, or structural damage. Doing so might cause severe
electrical shock
1. After the emergency situation is over or power is restored, visually check the
storage subsystem for damage. Is there evidence of damage to any of the
storage subsystem components, cables, or equipment attached to the storage
subsystem?
v Yes – Do not continue with this procedure. Contact your IBM service
representative for assistance. Depending on the current service agreements,
you might need to return the equipment to the factory or local service center
for repair.
v No – Go to step 2.
Potential data loss – Before resetting circuit breakers in the cabinet, ensure
that the storage subsystem and storage expansion enclosures power
switches are turned off. Resetting circuit breakers after an emergency
situation while the storage subsystem and storage expansion enclosure
power switches are turned on can cause potential data loss because the
configuration components might not be powered on in the correct sequence.
See “Turning on the storage subsystem” on page 119 for details about the
correct power-on sequence.
2. After you check the storage subsystem for damage, ensure that the power
switches are in the off position; then plug in the DS4700 Express power cables,
if required.
3. Check the system documentation of the hardware devices that you want to turn
on and determine the proper startup sequence.
Note: Be sure to turn on all of the storage expansion enclosures and verify that
there are not any ESM or power supply and fan unit fault LEDs lit before
you turn on the DS4700 Express.
In addition, consider the following items:
v The storage subsystem supports simultaneous power-up of the system
components; however, you should always follow the power-up
sequence listed in the “Turning on the storage subsystem section” of
Chapter 4. Operating the storage subsystem 137