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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 25.
4. Unpack the new EV-DDMs.
Set the EV-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 that:
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 DS4200 Express 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 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.
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 EV-DDMs" on page 114 to remove
the EV-DDMs that you want to replace. Use the procedures in "Installing
hot-swap EV-DDMs" on page 112 to install the new EV-DDMs into the storage
subsystem.
8. After you install all the new EV-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 storage expansion
Chapter 5. Replacing components
117
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