IBM 71455RU, Installation And User Manual

Page: 95 / 136

- 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 11. Memory-mirroring mode DIMM population sequence for the MAX5 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 MAX5, populate the larger capacity
DIMMs first; then the smaller capacity DIMMs.
The following illustration shows the location of the DIMMs connectors on the
system-board tray.
Chapter 2. Installing optional devices
77