Table 40 Cooling subsystem events that light SID LEDs —
NotesSourceCauseSample IPMI EventsDiagnostic
LEDs
Cleared when fan is
replaced
iLO 3Fan has either
previously failed or
is degrading
Type 02h, 0Ah:07h:01h
COOLING_UNIT_WARNING
Fans (1-6)
Cleared when fan is
replaced
iLO 3Fan has failed and
no longer meets
minimum
requirements
Type 02h, 0Ah:07h:02h
COOLING_UNIT_FAILURE
Fans (1-6)
Troubleshooting the I/O
This subsection provides information on troubleshooting issues with the public PCIe slots.
I/O subsystem behaviors
The main role of the I/O subsystem is to transfer blocks of data and instruction words between
physical shared memory and virtual memory (system disks or disk array). The system boot is the
first time blocks of data and instructions are transferred into physical memory from a local disk or
DVD or over the network. This process is referred to as Direct Memory Access (DMA) and is initiated
by I/O devices located in I/O or on Host Bus Adapter (HBA) I/O cards and does not involve any
logical CPUs.
Customer messaging policy
• Always refer to the SEL for any action from low level I/O subsystem faults as there may not
be any lighted LEDs on the System Insight Display.
• For configuration style errors, for example, no iLO 3 MP or core I/O HBAs installed or working,
see Supported Configurations subsection for actions.
• Some diagnostic messages are reported for high level I/O subsystem errors; all fatal I/O
subsystem errors cause global MCAs.
Table 41 I/O subsystem events that light SID LEDs
NotesSourceCauseSample IPMI eventsDiagnostic
LEDs
Likely a short on
I/O card or I/O
slot.
BMCOver-current on PCI slotType 02h, 03h:05h:01h
CURRENT_LIMIT_EXCEEDED
I/O Card
A voltage on the
I/O backplane is
out of range
(likely too low)
BMCVoltage on CRU is
inadequate
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RECOVERABLE
I/O Backplane
A voltage on the
I/O backplane is
out of range
(likely too low)
BMCVoltage on CRU is
inadequate
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RECOVERABLE
Disk Backplane
90 Troubleshooting
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