Troubleshooting the I/O
Cause
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 processors.
Customer messaging policy
• See the SEL for any action from low level I/O subsystem faults, because the System Insight Display
may not have any illuminated LEDs.
• For configuration-type errors, for example, no iLO 3 MP or core I/O HBAs installed or working, see
Supported configurations on page 107
for actions.
• Some diagnostic messages are reported for high level I/O subsystem errors. All fatal I/O subsystem
errors cause global MCAs.
Table 37: I/O subsystem events that light SID LEDs
Diagnostic
LEDs
Sample IPMI events Cause Source Notes
I/O Card Type 02h, 03h:05h:01h
CURRENT_LIMIT_EXCEEDED
Over-current on PCI
slot
iLO MP Likely a short
on I/O card or
I/O slot.
I/O Riser Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RE
COVERABLE
Voltage on CRU is
inadequate
iLO MP A voltage on
the I/O riser is
out of range
(likely too low)
Disk
Backplane
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RE
COVERABLE
Voltage on CRU is
inadequate
iLO MP A voltage on
the disk
backplane is
out of range
(likely too low)
Troubleshooting the I/O 121
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