IBM TotalStorage DS4800, Инструкция по установке, эксплуатации и обслуживанию

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When the storage subsystem is operating normally, the numeric display shows the
enclosure identification (enclosure ID) of the storage subsystem and the diagnostic
LED flashes once every two seconds. The storage subsystem tray ID is normally
set at the factory to either values 85 or 00. Verify that the attached storage
expansion enclosures are not set to either of these enclosure IDs.
Note: It is not recommended, but you can set the storage subsystem enclosure ID
through the DS4000 Storage Manager software. The enclosure ID is an
attribute of the storage subsystem; both controllers display the same
enclosure ID. It is possible, however, that one controller will display the
enclosure ID, while the other controller displays a diagnostic code.
If an error has occurred and the controller Needs Attention LED is on, the numeric
display shows diagnostic information. The numeric display indicates the information
is diagnostic by illuminating an LED that appears as a decimal point between the
display numbers. The diagnostic LED tuns off when the numeric display shows the
storage subsystem enclosure ID. The numeric display shows various diagnostic
codes as the controllers perform the startup process after each power cycle or
reset. After diagnostics are complete, the current storage subsystem enclosure ID is
displayed.
Diagnostic codes in the form of Lx, where x is a hexadecimal digit, indicate
controller state information. In general, these codes are displayed only when the
controller is in a non-operational state. The controller might be non-operational due
to a configuration problem (such as mismatched controller types), or it might be
non-operational due to hardware faults. If the controller is non-operational due to
system configuration, the controller Needs Attention LED is off. If the controller is
non-operational due to a hardware fault, the controller Needs Attention LED is on.
The definitions for Lx diagnostic codes are listed in Table 36 on page 125.
76041
Diagnostic LED
Seven-
segment
display
ds48042
Figure 76. Numeric display LEDs
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IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide