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Attention: When you handle static-sensitive devices, take precautions to
avoid damage from static electricity. For details about handling static-sensitive
devices, see “Handling static-sensitive devices” on page 33.
4. Unpack the new E-DDMs.
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. Refer to the IBM System
Storage DS4700 Storage Subsystem Installation, User's, and
Maintenance Guide for the location of the Cache active LEDs.
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: To turn 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:
The power switch on the power supply and fan unit does not turn off
the electrical current supplied to the device. The DS4700 Express
Storage Subsystem might also have more than one connection to dc
power. To remove all electrical current from the device, ensure that all
dc power cords are disconnected from the power supply and fan unit
dc 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 155 to remove
the E-DDMs that you want to replace. Use the procedures in “Installing
hot-swap E-DDMs” on page 153 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:
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
158 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide