IBM 7940, Problem Determination And Service Manual

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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See Chapter 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 to determine which components
are customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
BMC log message
Sensor
type Sensor
number
Action
CPU 1 DIMM 1A DIMM Multi-Bit Error
CPU 1 DIMM 1B DIMM Multi-Bit Error
CPU 1 DIMM 2A DIMM Multi-Bit Error
CPU 1 DIMM 2B DIMM Multi-Bit Error
CPU 1 DIMM 3A DIMM Multi-Bit Error
CPU 1 DIMM 3B DIMM Multi-Bit Error
CPU 2 DIMM 1A DIMM Multi-Bit Error
CPU 2 DIMM 1B DIMM Multi-Bit Error
CPU 2 DIMM 2A DIMM Multi-Bit Error
CPU 2 DIMM 2B DIMM Multi-Bit Error
CPU 2 DIMM 3A DIMM Multi-Bit Error
CPU 2 DIMM 3B DIMM Multi-Bit Error 0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch
0Ch 00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
1. Replace the bad DIMM.
2. (Trained service technician only) Replace
the system board.
BIOS-logged BMC system-event log messages
BIOS can log two types of system-event log messages: POST events, which occur
during system startup, and SMI events, which are generally run time errors detected
by hardware.
The server logs OEM-specific BIOS messages in the BMC system-event log. The
following table describes the four BIOS record types logged in the BMC
system-event log. You can obtain third-party software to provide BMC system-event
log translations for detailed byte definitions and repair actions.
v
Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 to determine which components
are customer replaceable units (CRU) and which components are field replaceable units (FRU).
v
If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Sensor type
Record type, OEM SEL
DATA byte definition and
description
Byte definition and description
OEM POST
with
Timestamp For all record types 0xC0
and Byte 1 = 0x00 Byte 1 = 0x00 - PCI Event/Error Occurred. Next non-timestamped
OEM SEL entry will contain details of the specific PCI event/error
Byte 1 = 0x01 - Processor Event/Error Occurred. Next
non-timestamped OEM SEL entry will contain details of the specific
PCI event/error
Byte 1 = 0x02 - Memory Event/Error Occurred. Next non-timestamped
OEM SEL entry will contain details of the specific PCI event/error
Byte 1 = 0x04 - Bus PCI Event/Error Occurred. Next non-timestamped
OEM SEL entry will contain details of the specific PCI event/error
Byte 1 = 0x05 - Chipset Event/Error Occurred. Next non-timestamped
OEM SEL entry will contain details of the specific PCI event/error
specific PCI event/error
Chapter 5. Diagnostics
115