I/O Backplane (LBAs/Ropes/PDH/PCI-X/PCIe Slots)
This subsection provides information on troubleshooting issues with the three public PCI-X/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 / disk array). The system boot is the
first time blocks of data and instructions words are transferred into physical shared memory
from a local disk / DVD or from a remote disk on another server through multiple LAN transfers.
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.
A secondary role of the I/O subsystem is to transfer data between the internal registers within
each CPU core and the internal control/store registers within the zx2 / PDH / Local Bus Adapters
(LBA) and HBA chips. This process is referred to as programmed I/O and is initiated by logical
CPUs executing external LOAD / STORE instructions. Both system firmware and OS kernel both
use this method to initiate DMA transfers.
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. IPMI events in SEL / FPL provide the
logical ACPI path of suspect I/O subsystem CRU. Use Table 5-23 to determine the physical
PCI slot number.
• For configuration style errors, for example, no iLO 2 MP / 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. HP-UX provides its own path with the physical rope
number of the suspect I/O subsystem CRU. Use Table 5-23 to determine the physical PCI
slot number.
Table 5-21 I/O Subsystem Events That Light System Insight Display LEDs
NotesSourceCauseSample IPMI EventsDiagnostic
LED(s)
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
BMCVoltage on CRU is
inadequate
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RECOVERABLE
I/O Backplane
out of range
(likely too low)
A voltage on the
I/O backplane is
BMCVoltage on CRU is
inadequate
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RECOVERABLE
Disk
Backplane
out of range
(likely too low)
Table 5-22 I/O Card Events That May Light System Insight Display LEDs
NotesSourceCauseSample IPMI EventsDiagnostic
LED(s)
Disallow O/S
boot and display
SFWA non hot plug I/O
slot power
Type E0h, 4658d:26d
IO_PCI_POWER_OVERLOAD_ERR
I/O Card
the following EFIconsumption
error message,increases the total I/O
“I/Opower consumption
I/O Backplane (LBAs/Ropes/PDH/PCI-X/PCIe Slots) 131
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