IBM 7145, Installation And User Manual

Page: 94 / 136

Table 9. DIMM banks and connectors (continued)
Bank of DIMMs DIMM connectors
3rd bank of DIMMs 17, 18, 19, 20, 21, 22, 23, and 24
4th bank of DIMMs 25, 26, 27, 28, 29, 30, 31, and 32
v DIMMs must be installed in pairs for non-mirroring mode and in sets of four for
memory-mirroring mode.
v
A minimum of two DIMMs must be installed in the MAX5 for each microprocessor
in the host server.
v
The maximum operating speed of the MAX5 is determined by the slowest DIMM
installed in the MAX5.
v The MAX5 does not come with any DIMMs installed when you purchase it as a
option. When you install DIMMs, install them in the order shown in the following
tables to optimize system performance.
v
The server supports non-mirroring mode and memory-mirroring mode.
– Non-mirroring mode . When you use the non-mirroring mode, install DIMMs
as indicated in the following table:
Table 10. Non-mirroring mode DIMM population sequence for the MAX5 memory expansion
module
Pairs of DIMMs DIMM connector population sequence
Pair 1 28, 29
Pair 2 9, 16
Pair 3 1, 8
Pair 4 20, 21
Pair 5 26, 31
Pair 6 11, 14
Pair 7 3, 6
Pair 8 18, 23
Pair 9 27, 30
Pair 10 10, 15
Pair 11 2, 7
Pair 12 19, 22
Pair 13 25, 32
Pair 14 12, 13
Pair 15 4, 5
Pair 16 17, 24
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 DIMMs
simultaneously. If a failure occurs, the memory controller switches from the
primary set of 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 87.
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IBM System x3850 X5 and x3950 X5 Types 7145 and 7146: Installation and User’s Guide