IBM x3690 X5 Service Manual page 404

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System x3690 X5 Types 7147, 7148, 7149, and 7192: Problem Determination and Service Guide
Table 26. Non-mirroring mode DIMM population sequence for the MAX5 memory expansion
module (continued)
Pairs of DIMMs
Pair 2
Pair 3
Pair 4
Pair 5
Pair 6
Pair 7
Pair 8
Pair 9
Pair 10
Pair 11
Pair 12
Pair 13
Pair 14
Pair 15
Pair 16
Note: When you populate DIMMs in the MAX5, populate the larger capacity
DIMMs first; then the smaller capacity DIMMs.
– Memory-mirroring mode. When you use the mirroring mode feature,
consider the following information:
- Memory-mirroring mode replicates and stores data on sets of four DIMMs
simultaneously. If a failure occurs, the memory controller switches from the
primary set of memory DIMMs to the backup set of DIMMs. To enable
memory mirroring through the Setup utility, select System Settings →
Memory. For more information, see "Using the Setup utility" on page 402.
- DIMMs must be installed in sets of four. The DIMMs in each set must be
the same size and type. This is applicable also when the MAX5 expansion
module is attached to a host server and the host server has an optional
memory tray installed in the server. You must install DIMMs in sets of four
DIMMs for memory-mirroring mode in each (server, memory tray, and the
MAX5).
- The maximum available memory is reduced to half of the installed memory
when memory mirroring is enabled. For example, if the MAX5 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 27. Memory-mirroring mode DIMM population sequence for the MAX5 memory
expansion module
Sets of 4 DIMMs
Set 1
Set 2
Set 3
DIMM connector population sequence
9, 16
1, 8
20, 21
26, 31
11, 14
3, 6
18, 23
27, 30
10, 15
2, 7
19, 22
25, 32
12, 13
4, 5
17, 24
DIMM connector population sequence
9, 16, 28, 29
1, 8, 20, 21
11, 14, 26, 31