Performing An Emergency Shutdown; Restoring Power After An Emergency Shutdown - IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual

v The internal temperature of the storage subsystem exceeds the maximum
v There is a general power failure or a loss of power to the unit.
v You are forced to shut down the storage subsystem without performing the
Attention:
the system after an unexpected shutdown.
If the storage subsystem shuts down unexpectedly, go to "Restoring power after an
over-temperature shutdown" on page 96. Otherwise, go to "Restoring power after
an emergency shutdown."
Note: Unattended restoration of power is supported; however, if power restoration

Performing an emergency shutdown

Attention:
conditions, or other hazardous circumstances. If a power outage or emergency
situation occurs, always turn off all power switches on all computing equipment.
This will help safeguard your equipment from potential damage due to electrical
surges when power is restored. If the storage subsystem loses power unexpectedly,
it might be due to a hardware failure in the power system or midplane (see
"Troubleshooting" on page 145).
Use the following procedure to shut down the storage subsystem during an
emergency:
1. If you have time, stop all I/O activity to the storage subsystem by shutting down
2. Check the LEDs (front and back). Make note of any Fault LEDs that are on so
3. Turn off all power-supply switches starting with the DS4300 storage subsystem

Restoring power after an emergency shutdown

Use the following procedure to restart the storage subsystem if you turned off the
power-supply switches during an emergency shutdown, or if a power failure or a
power outage occurred:
operating temperature (an over-temperature condition).
If both fan CRUs fail or are unable to maintain an internal temperature below
70°C (158°F), one or both of the power supplies in the storage subsystem will
shut down. If both power supplies shut down, the unit is inoperable.
The storage-management software warns you if the temperature of the unit is
rising, before it has risen sufficiently to shut down the power supplies. The first
warning comes when the storage subsystem internal temperature exceeds 45°C
(113°F). The storage subsystem shuts down if the temperature rises to 70°C
(158°F).
normal shutdown procedures (listed in "Turning off the storage subsystem" on
page 93) because of an emergency situation.
To avoid damage to the hardware, take special care when restarting
is attended, you should follow the best practices guidelines and the power
restoration sequence in "Turning on the storage subsystem" on page 92.
Emergency situations might include fire, flood, extreme weather
the host or disconnecting the storage subsystem logical drives through the host.
you can correct the problem when you turn on the power again.
power supply switches first and then the power supply switches of the attached
storage expansion enclosures; then unplug the power cords from the storage
subsystem.
Chapter 4. Operating the storage subsystem
95