IBM EXP400 Type 1733, Hardware Maintenance Manual And Troubleshooting Manual

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Major components of the expansion unit
The orange color on components and labels in the expansion unit indicates
hot-swap or hot-plug components. You can install or remove these components
while the expansion unit is running. For information about installing hot-swap and
hot-plug components, see Chapter 4, “Installing and replacing components,” on
page 23.
The blue color on components and labels indicates touch points, where a
component can be gripped, a latch moved, and so on.
The following illustration shows the locations of major components in your
expansion unit.
Note: The illustrations in this publication might differ slightly from your hardware.
Hot-swap power supply with fan units
Hot-swap ESMs
Hard disk drives Filler panel
What your expansion unit offers
The expansion unit provides several features for easy operation, including:
v
Customer replaceable units (CRUs)
The CRUs in your expansion unit are: Ultra320 hard disk drives, ESMs, and
power supply with fan units.
v
Fault indicators
All CRUs have fault or status light emitting diodes (LEDs) to indicate hardware
failures.
v
Switch selectable Box ID and user configuration settings
The ESM contains five sets of configuration switches that you can set according
to your configuration. For detailed information about these switches and their
settings, see Chapter 2, “ESM configuration switches,” on page 15.
v Redundant cooling and power capabilities
Expansion unit models 1RU and 1RX use a dual ac input power system. This
means both power switches must be turned on for proper redundant operation.
The redundant cooling of the fans in your expansion unit enables continued
operation if one fan fails. Your expansion unit comes with two 500-watt hot-swap
power supply with fan units, which provide redundant power for many expansion
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IBM EXP400 Storage Expansion Unit Type 1733: Hardware Maintenance Manual and Troubleshooting Guide