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

Statement 5
Use the following procedure to turn off the power:
1. Before proceeding, use the storage-management software to determine the
2. Use the storage-management software to check the status of the storage
3. Perform the following steps:
4. Turn off the power to each device based on the following shutdown sequence:
5. After you perform the necessary maintenance procedures, turn on the power

Restoring power after an unexpected shutdown

The storage subsystem might shut down unexpectedly under any of the following
conditions:
Attention:
94
IBM TotalStorage DS4300 Fibre Channel Storage Subsystem: Installation, User's, and Maintenance Guide
status of the system components and special instructions. The operating system
software might require you to perform other procedures before you turn off the
power.
subsystem. Correct problems that are reported before you turn off the power.
a. Stop all I/O activity to the storage subsystem and attached storage
expansion enclosures. Make sure of the following:
v All of the green Drive active LEDs on the front of the storage subsystem
(and on all attached storage expansion enclosures) are not flashing.
v The green Cache active LEDs located on the controller modules viewable
from the back of the DS4300 storage subsystem are off.
b. Before the storage subsystem is powered off, use the operating system
software to either disconnect the storage subsystem logical drives from the
host or to flush the logical drive data cache in the host server memory.
Attention: 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 4 for the proper shutdown 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
storage expansion enclosures. Turn off both power supply switches on the
back of the storage subsystem.
c. Turn off power to other supporting devices (for example, management
stations, fibre-channel switches, or Ethernet switches).
Note: You do not need to perform this step if you are servicing only the
storage subsystem.
using the procedure in "Turning on the storage subsystem" on page 92.
There might be data loss in each of the following cases: