IBM System Storage Subsystem DS5020 - Manual (Page 143)

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, make
sure 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.
2. After you check the storage subsystem for damage, make sure that the power
switches are in the off position; then plug in the DS5020 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 DS5020.
In addition, consider the following items:
v The storage subsystem supports simultaneous power-up of the system
components, but you must always follow the power-up sequence listed
in the “Best practices guidelines” on page 5 section during any
attended power-up procedure.
v A storage subsystem in an optimal state recovers 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 any attached disconnect devices.
6. Turn on both of the power supply switches on the DS5020. The green LEDs on
the front and the back of the DS5020 remain lit. If other amber Fault LEDs light,
see “Solving problems” on page 153.
Chapter 4. Operating the storage subsystem 113