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available when memory mirroring is enabled. Note that some Windows
operating systems do not recognize memory mirroring when they report the
amount of available memory and instead report the total DIMM capacity.
To enable 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, cards 3 and 4 mirror each other,
memory cards 5 and 6 mirror each other, and cards 7 and 8 mirror each other.
Install DIMMs in the sequence shown in the following table.
Table 9. Memory-card installation sequence for memory-mirroring configuration
DIMM quad installation
order Memory card Connector numbers
First 1 1 and 8
2 1 and 8
Second 7 1 and 8
8 1 and 8
Third 3 1 and 8
4 1 and 8
Fourth 5 1 and 8
6 1 and 8
Fifth 1 3 and 6
2 3 and 6
Sixth 7 3 and 6
8 3 and 6
Seventh 3 3 and 6
4 3 and 6
Eighth 5 3 and 6
6 3 and 6
Ninth 1 2 and 7
2 2 and 7
Tenth 7 2 and 7
8 2 and 7
Eleventh 3 2 and 7
4 2 and 7
Twelfth 5 2 and 7
6 2 and 7
Thirteenth 1 4 and 5
2 4 and 5
Fourteenth 7 4 and 5
8 4 and 5
Fifteenth 3 4 and 5
4 4 and 5
Sixteenth 5 4 and 5
6 4 and 5
68 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide