IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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Memory errors
If the memory is configured for 2-way or 4-way memory interleaving and a single
DIMM fails, the lights for all of the interleaved DIMMs on that bank will be lit. Before
replacing all DIMMs on that bank:
1. Reseat all DIMMs on that bank.
2. Check for a memory mismatch.
3. Run the diagnostic programs (see “Starting the diagnostic programs” on page
29) and Chapter 6, “Symptom-to-FRU index,” on page 127.
If a memory error is identified by the bank in which the failing DIMM is located, use
the following table to determine the correct group of DIMMs:
Table 3. Memory bank installation
Pairs 2-way installation order 4-way installation order Bank number
1 1. D2, D8 (std) 1. D2, D8, D1, D7 Bank 3
2 2. D4, D10 2. D4, D10, D3, D9 Bank 2
3 3. D6, D12 3. D6, D12, D5, D11 Bank 1
ServerGuide error symptoms
Look for the symptom in the left column of the chart. Probable solutions to the
problem are in the right column.
Table 4. ServerGuide Setup and Installation CD
Symptom Suggested action
The ServerGuide
Setup and
Installation CD will
not start.
v
Ensure that the server is supported and has a startable (bootable)
CD-ROM drive.
v
If the startup (boot) sequence settings have been altered, ensure
that the CD-ROM drive is first in the startup sequence.
v
If more than one CD-ROM drive is installed, ensure that only one
drive is set as the primary drive. Start the CD from the primary
drive.
The SCSI RAID
program cannot
view all installed
drives, or the NOS
cannot be installed.
v
Ensure that there are no duplicate SCSI IDs or IRQ assignments.
v
Ensure that the hard disk drive is connected properly.
The Operating
System Installation
program
continuously loops.
Make more space available on the hard disk.
The ServerGuide
program will not
start your NOS CD.
Ensure that the NOS CD you have is supported by the ServerGuide
program. See the ServerGuide Setup and Installation CD label for a
list of supported NOS versions.
The NOS cannot
be installed; the
option is not
available.
Ensure that the NOS is supported on your server. If the NOS is
supported, either there is no logical drive defined (SCSI RAID
systems) or the ServerGuide System Partition is not present. Run the
ServerGuide program, and ensure that setup is complete.
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xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide