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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 DS4500 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, power supply, or fan and communications
module fault LEDs lit before you turn on the DS4500.
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.
4.
Turn on the power to each device, based on the startup sequence.
5. Turn on both of the power supply switches on the DS4500. The green LEDs on
the front and the back of the DS4500 should remain lit. If other amber Fault
LEDs light, see the appropriate section for the DS4500 in the IBM TotalStorage
DS4000 Hardware Maintenance Manual.
Recovering from an overtemperature condition and power supply
shutdown
If the fan and communications module fails or is unable to maintain an internal
temperature below 70° C (158° F), one or both of the power supplies in the DS4500
Storage Subsystem might shut down (see Figure 94 on page 140). If both power
supplies shut down, the DS4500 Storage Subsystem is not operational.
Chapter 4. Operating the storage subsystem 139