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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 6 for the proper shutdown sequence.
6. Turn off the power to each device based on the following shutdown sequence:
a. Turn off power to the host before you turn off power to 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
EXP810. Turn off both power supply switches on the back of the storage
subsystem.
CAUTION:
The power control button on the device and the power switch power
supply do not turn off the electrical current supplied to the device.
The device might also 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.
c. Turn off power to other supporting devices (for example, management
stations, fibre-channel switches, or Ethernet switches).
7. Use the procedures in "Replacing hot-swap hard disk drives" on page 95 to
remove the E-DDMs that you want to replace. Use the procedures in "Installing
hot-swap hard disk drives" on page 94 to install the new E-DDMs into the
EXP810.
8. After you install all the new E-DDMs, check the system documentation for the
hardware devices that you intend to power up, and then determine the proper
startup sequence. Use the following power-on sequence, where applicable:
a. Turn on the power to the supporting devices (for example, Ethernet
switches and management stations) before you turn off power to the
storage subsystem.
b. You must turn on the storage expansion enclosures before the storage
subsystem. The controllers might not recognize the correct configuration if
the drives are powered up after the storage subsystem. For instructions on
powering up the storage subsystem, see the storage subsystem
documentation.
c. Turn on the power to the storage subsystem; then restart or turn on the
power to the host.
9. Turn on the power to each device, based on the power-on sequence in step 8.
To turn on power to the storage subsystem and the EXP810s, 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.
10. Check the green Drive activity LEDs and the amber Drive fault LEDs above
the new drive CRUs.
Make sure that the Drive activity LEDs are on and the Drive fault LEDs are off.
Note: The Drive fault LEDs might flash intermittently while the E-DDMs spin
up.
v If the Drive activity LED is off, the E-DDM CRU might not be installed
correctly. Remove the E-DDM CRU, wait 30 seconds, and then reinstall it.
Chapter 5. Installing and replacing components
99
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