When you turn on the power to the storage or storage enclosure, the numeric
display LEDs cycle through various codes as the controller or ESM firmware starts
to boot. If the diagnostic LED is illuminated and the heartbeat LED is turned off, it
indicates that diagnostic information is displayed on the numeric display. When
the controller completes the boot process and is operating normally, the diagnostic
LED turns off, the heartbeat LED flashs, and the numeric display changes to show
the enclosure identification (enclosure ID) for that individual enclosure.
If an error occurs during the boot process and the Needs Attention LED is on, the
numeric display shows diagnostic information as sequence of 2-digit diagnostic
code. The number of time each 2-digit code is displayed during a sequence is fixed
and under hardware control. Each sequence minimally consists of a two-digit
category code, followed by a two-digit detail code that is specific to the category.
Longer sequences can be displayed if more than one event is to be reported. This
nominally consists of a series of category-detail sequences with a delimiter
between each category-detail sequence. The entire display goes blank at the end of
the sequence (all segments off, the diagnostic light off), and then the sequence
repeats.
For more information about the diagnostic codes and their possible causes, see
“Seven-segment display sequence codes and their causes” on page 169.
ESM LEDs
This section describes the ESM LEDS. Figure 87 on page 95 shows the LEDs on the
ESM.
A
D
B
F
CE
G
SSD 1
D
A
E
C
FB
G
SSD 2
DP
DP
Diagnostic Light
Heartbeat Light
Lower DigitUpper Digit
dcsi0038
Figure 86. Numeric display LEDs
94 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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