Restoring Power After An Unexpected Shutdown - IBM DCS3860 Installation, User's, And Maintenance Manual

2. Check the LEDs. Note down any amber LEDs that are lit so that you can
3. Turn off all power-supply switches, starting with the DCS3860 storage system

Restoring power after an unexpected shutdown

Complete the following steps to restore power to the storage system after an
unplanned shutdown:
DANGER
1. After the emergency situation is over or power is restored, check the storage
2. If there is evidence of damage to any of the storage system components, cables,
3. After you check the storage system for damage, ensure that the power switches
4. Check the system documentation of the hardware devices that you want to
5. Turn on both of the power-supply switches on EXP3800 expansion enclosures
6. Turn on both of the power-supply switches on the DCS3860 storage system. See
correct the problem when you turn on the power again.
first and followed by the EXP3800 expansion enclosures. Then, disconnect the
power cables from the storage system.
Never turn on any equipment when there is evidence of fire, water, or
structural damage.
system for damage.
or equipment that is attached to the storage system, do not continue with this
procedure. Contact your IBM technical-support representative for assistance.
Depending on the current service agreements, you might have to return the
equipment to the factory or local service center for repair.
Attention: To avoid potential data loss, ensure that the storage system and the
expansion enclosure power switches are turned off before you reset circuit
breakers in the rack. Resetting circuit breakers after an emergency situation
while the storage system and the expansion enclosure power switches are
turned on can cause data loss, because the configuration components might not
be powered-on in the correct sequence. See "Powering on the DCS3860" on
page 56 for details about the correct power-on sequence.
are off; then connect the DCS3860 power cables, if required.
turn on and determine the correct startup sequence.
and make sure that no ESM or power-supply fault LEDs are lit before you
power on the DCS3860 storage system.
In addition, consider the following items:
v The storage system supports simultaneous power-on of the system
components. However, always check the system documentation of the
hardware devices that you want to turn on and determine the correct startup
sequence.
v A storage system in an optimal state recovers automatically from an
unexpected shutdown and unattended simultaneous restoration of power to
system components. After power is restored, contact your IBM
technical-support representative if any of the following conditions occur:
– The storage system logical drives and arrays do not display in the Storage
Manager graphical user interface.
– The storage system logical drives and arrays do not come online.
– The storage system logical drives and arrays seem to be degraded.
"Solving problems" on page 123.
Chapter 4. Operating the DCS3860 storage system and EXP3800 expansion enclosure
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