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2. After you check the storage subsystem for damage, ensure that the power
3. Check the system documentation of the hardware devices that you want to turn
4. Turn on the power to each device, based on the startup sequence.
5. Turn on both of the power supply switches on the DS4200 Express. The green
Recovering from an overheated power supply and fan unit
Each storage subsystem contains two power supply and fan units. Each power
supply and fan unit contains a built-in temperature sensor designed to prevent it
from overheating. Under normal operating conditions, with an ambient air
temperature range of 10° C to 35° C (50° F to 95° F), the fans in the power supply
and fan units maintain a proper operating temperature inside the module.
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IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
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 81 for details about the
correct power-on sequence.
switches are in the off position; then plug in the DS4200 Express power cables,
if required.
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 DS4200 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
the appropriate DS4000 Storage Subsystem Installation, User's, and
Maintenance Guide during any attended power-up procedure.
v A storage subsystem in an optimal state should recover automatically
from an unexpected shutdown and unattended simultaneous
restoration of power to system components. After power is restored,
contact IBM technical support if any of the following conditions occur:
– The storage subsystem logical drives and subsystems do not
display in the Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and subsystems do not come
online.
– The storage subsystem logical drives and subsystems seem to be
degraded.
LEDs on the front and the back of the DS4200 Express should remain lit. If
other amber Fault LEDs light, see "Solving problems" on page 135.
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