Restoring Power After An Unexpected Shutdown - IBM TotalStorage DS300 Hardware Installation And User's Manual

4. From the ServeRAID Manager interface, shut down the RAID controller to flush
5. If applicable, use the operating-system software to disconnect the storage
6. Turn off the power to each device according to the following shutdown
After you perform the necessary maintenance procedures, turn on the power by
using the procedure in "Turning on the storage subsystem" on page 51.

Restoring power after an unexpected shutdown

The storage subsystem might shut down unexpectedly under any of the following
conditions.
Attention:
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.
v All of the green drive-active LEDs on the front of the storage subsystem (and
on all attached expansion units) are not flashing.
v The green cache-active LEDs on the back of the storage subsystem are off.
the data from the cache.
subsystem logical drives from the host before the storage subsystem is turned
off.
Note: To turn off all power to the storage subsystem, you must turn off both
power-supply switches and disconnect both power cords. Use the procedure in
step 6 for the proper shutdown sequence.
sequence:
a. Turn off power to the host before the storage subsystem. If the host must
stay powered on to support an existing network, see the operating-system
documentation for information about disconnecting the storage subsystem
logical drives from the host before the storage subsystem is powered off.
b. Turn off power to the storage subsystem before you turn off power to the
expansion units. Turn off both power-supply switches on the back of the
storage subsystem.
c. Turn off power to other supporting devices, such as management stations,
Fibre Channel switches, Fibre Channel managed hubs, or Ethernet switches.
Note: You do not have to perform this step if you are servicing only the
storage subsystem.
There might be data loss in each of the following cases.
operating temperature (an overtemperature condition).
If multiple fans 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 ServeRAID Manager program warns you if the temperature of the unit is
rising, before it has risen sufficiently to shut down the power supplies.
normal shutdown procedures (listed in "Turning off the storage subsystem" on
page 52) because of an emergency situation.
To avoid damage to the hardware, take special care when restarting
Chapter 9. Turning the storage subsystem on and off
53