Set the E-DDMs on a dry, level surface away from magnetic fields. Save the
packing material and documentation in case you need to return them.
5. Perform the following steps:
a. Stop all I/O activity to the storage subsystem and attached storage
expansion enclosures. Make sure of the following:
1) All of the green Drive activity LEDs on the front of the storage
subsystem (and on all attached storage expansion enclosures) are not
flashing.
2) The green Cache active LEDs are off.
b. If applicable, use the operating system software to disconnect the storage
subsystem logical drives from the host before you power off the storage
subsystem.
Attention: Toturn off all power to the storage subsystem, you must turn off
both power supply and fan unit 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
storage expansion enclosures. Turn off both power supply switches on the
back of the storage subsystem.
CAUTION:
This unit has more than one power source. To remove all power from
the unit, all MAINS must be disconnected.
CAUTION:
The power switch on the power supply and fan unit does not turn off
the electrical current supplied to the device. The DS5020 storage
subsystem might also have more than one connection to power. To
remove all electrical current from the device, ensure that all power
cords are disconnected from the power supply and fan unit input
connectors.
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 E-DDMs” on page 130 to remove
the E-DDMs that you want to replace. Use the procedures in “Installing
hot-swap E-DDMs” on page 128 to install the new E-DDMs into the storage
subsystem.
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:
Chapter5. Replacing components 133