IBM System Storage DCS3700 User Manual

When you turn on the power to the storage or storage enclosure, the numeric display LEDs cycle though
various codes as the controller or ESM firmware starts to boot.
When the storage subsystem is operating normally, the numeric display shows the enclosure
identification (enclosure ID) for that individual enclosure.
If an error has occurred and the 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 enclosure ID. The numeric display shows various diagnostic codes as the enclosures
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 or Hx, where x is a hexadecimal digit, indicate storage subsystem
state information. In general, these codes are displayed only when the storage subsystem is in a
non-operational state. The storage subsystem might be non-operational due to a configuration problem
(such as mismatched types), or it might be non-operational due to hardware faults. If the storage
subsystem is non-operational due to system configuration, the storage subsystem Needs Attention LED is
off. If the storage subsystem is non-operational due to a hardware fault, the storage subsystem Needs
Attention LED is on. The definitions for Lx diagnostic codes are listed in Table 18.
Table 18. Controller numeric display diagnostic codes
Value Description
L0 Mismatched controller board ID.
L1 Missing interconnect canister.
L2 Persistent memory errors.
L3 Persistent hardware errors.
L4 Persistent data protection errors.
L5 ACS failure.
L6 Unsupported host card.
L7 Submodel identifier not set or mismatched.
76041
Diagnostic LED
Seven-
segment
display
ds48042
Figure 58. Numeric display LEDs
80 IBM System Storage DCS3700: Installation, User, and Maintenance Guide

IBM System Storage DCS3700 Specifications

General

Brand	IBM
Model	System Storage DCS3700
Category	Storage
Language	English