IBM 72336RU User Manual - Page 54

system-error LED on the front of the server, indicating that there is a problem

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Table 7. Memory-card installation sequence for memory-mirroring configuration (continued) DIMM pair installation order Memory card Connector numbers Third 1 2 and 6 2 2 and 6 Fourth 3 2 and 6 4 2 and 6 Fifth 1 3 and 7 2 3 and 7 Sixth 3 3 and 7 4 3 and 7 Seventh 1 4 and 8 2 4 and 8 Eighth 3 4 and 8 4 4 and 8 v There are four memory power buses, which are split among the four memory cards. v For memory mirroring, you must install DIMMs in sets of four, one pair in each memory card. All DIMMs in each set must be the same size and type. Memory cards 1 and 2 mirror each other, and memory cards 3 and 4 mirror each other. v If a problem with a DIMM is detected, light path diagnostics will light the system-error LED on the front of the server, indicating that there is a problem and guiding you to the defective DIMM. When this occurs, first identify the defective DIMM; then, remove and replace the DIMM. The following illustration shows the LEDs that are visible on top of the memory card. 42 IBM System x3850 M2 and System x3950 M2 Types 7141 and 7233: User's Guide

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Table 7. Memory-card installation sequence for memory-mirroring configuration (continued)
DIMM pair installation
order
Memory card
Connector numbers
Third
1
2 and 6
2
2 and 6
Fourth
3
2 and 6
4
2 and 6
Fifth
1
3 and 7
2
3 and 7
Sixth
3
3 and 7
4
3 and 7
Seventh
1
4 and 8
2
4 and 8
Eighth
3
4 and 8
4
4 and 8
v
There are four memory power buses, which are split among the four memory
cards.
v
For memory mirroring, you must install DIMMs in sets of four, one pair in each
memory card. All DIMMs in each set must be the same size and type. Memory
cards 1 and 2 mirror each other, and memory cards 3 and 4 mirror each other.
v
If a problem with a DIMM is detected, light path diagnostics will light the
system-error LED on the front of the server, indicating that there is a problem
and guiding you to the defective DIMM. When this occurs, first identify the
defective DIMM; then, remove and replace the DIMM.
The following illustration shows the LEDs that are visible on top of the memory
card.
42
IBM System x3850 M2 and System x3950 M2 Types 7141 and 7233: User’s Guide