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- The maximum available memory is reduced to half of the installed memory
when memory mirroring is enabled. For example, if the memory expansion
module has 64 GB of memory installed, only 32 GB of addressable memory
is available when you use memory mirroring.
- The following table lists the DIMM installation sequence for
memory-mirroring mode.
Table 13. Memory-mirroring mode DIMM population sequence for the memory expansion
module
Sets of 4 DIMMs DIMM connector population sequence
Set 1 9, 16, 28, 29
Set 2 1, 8, 20, 21
Set 3 11, 14, 26, 31
Set 4 3, 6, 18, 23
Set 5 10, 15, 27, 30
Set 6 2, 7, 19, 22
Set 7 12, 13, 25, 32
Set 8 4, 5, 17, 24
Note: When you populate DIMMs in the memory expansion module,
populate the larger capacity DIMMs first, then the smaller capacity DIMMs.
86 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide