Turning Off The Storage Subsystem - IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual

3. Turn on the power to each device, based on the power-on sequence in step 2
4. Use the storage-management software and the Fault LEDs to check the overall

Turning off the storage subsystem

Attention:
subsystem Fault LEDs are on. Correct the fault before you turn off the power. Use
the storage-management software and the Fault LEDs to check the overall status of
the storage subsystem and its components. All LEDs should be green on the front
of the storage subsystem. If they are not, use the storage-management software to
diagnose the problem (see "Monitoring status through software" on page 96). This
ensures that the storage subsystem will power up correctly later. For more
information, see "Troubleshooting" on page 145.
The storage subsystem is designed to run continuously, 24 hours a day. After you
turn on the storage subsystem, do not turn it off. Turn off the power only when:
v Instructions in a hardware or software procedure require you to turn off the
v A service technician tells you to turn off the power.
v A power outage or emergency situation occurs (see "Performing an emergency
Statement 5
CAUTION:
The power control button on the device and the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one
power cord. To remove all electrical current from the device, ensure that all power
cords are disconnected from the power source.
the drives are powered up after the storage subsystem. For instructions on
powering up the storage expansion enclosures, see the storage expansion
enclosure documentation.
c. Turn on the power to the storage subsystem; then restart or turn on the
power to the host.
Note: Depending on your operating system, you might not have to restart
the host. For more information, see the software installation guide for
your operating system.
on page 92. To turn on power to the storage subsystem, turn on the
power-supply switches on the back of the storage subsystem. You must turn on
both power-supply switches to take advantage of the redundant power supplies.
status of the storage subsystem and its components. All LEDs should be green
on the front of the storage subsystem. If they are not, use the
storage-management software to diagnose the problem (see "Monitoring status
through software" on page 96).
Note: The green Drive active LED and amber Drive fault LED below the drive
CRUs might flash intermittently as the drives spin-up. Wait until the
storage subsystem is finished powering up before checking the LEDs on
the front of the storage subsystem. For more information, see "Checking
the LEDs" on page 97.
Except in an emergency, never turn off the power if any storage
power.
shutdown" on page 95).
Chapter 4. Operating the storage subsystem
93