IBM DS3500

v Yes: 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.
v No: Go to step 2.
Attention: To avoid potential data loss, make sure that the storage
subsystem and 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 subsystem and 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 “Turning
on the storage subsystem” on page 68 for details about the correct power-on
sequence.
2. After you check the storage subsystem for damage, make sure that the power
switches are off; then connect the DS3500 power cables, if required.
3. Check the system documentation of the hardware devices that you want to turn
on and determine the correct startup sequence.
Be sure to turn on all of the expansion enclosures and make sure that no ESM
or power-supply fault LEDs are lit before you turn on the storage subsystem.
In addition, consider the following items:
v The storage subsystem 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 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 your IBM
technical-support representative if any of the following conditions occur:
– The storage subsystem logical drives and subsystems are not displayed in
the DS Storage Manager graphical user interface.
– 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, according to the startup sequence.
5. Turn on both of the power-supply switches on the DS3500. The green LEDs on
the front and the rear of the DS3500 should remain lit. If other amber LEDs are
lit, see Chapter 6, “Solving problems,” on page 127.
Recovering from an overheated power supply
Each storage subsystem contains two power supplies. Each power supply contains
a built-in temperature sensor to prevent the power supply 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 supplies maintain a suitable operating
temperature inside the module.
If the internal temperature reaches 65°C (149°F), the power supply shuts down
automatically. If both power supplies shut down because of overheating, the storage
subsystem has no power, and all LEDs are off.
The following factors can cause the power supplies to overheat:
v An unusually high room temperature
84 System Storage DS3500 and EXP3500: Installation, User’s, and Maintenance Guide