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2.2.1 Memory Installation Rules


2.2.1 Memory Installation Rules
Install the memory in accordance with the following rules:
  1. Install exactly 4, 8, or 16 memory modules.
  2. Install memory modules of the same capacity and rank in each of memory groups A and B.
  3. For memory groups A and B, you can install memory modules of different capacities between the groups.
    (For the permitted combinations of memory groups, see Table 2-1.)
  4. Install memory for group A first, then install memory for group B.
  5. To mount a 64 GB DIMM, see "Notes on Memory" in the latest version of the Fujitsu SPARC M12 Product Notes.
Table 2-1  Permitted Combinations of Memory Groups
-: Prohibited
DIMM Capacity Installed for Memory Group A DIMM Capacity Installed for Memory Group B
8 GB
16 GB
32 GB
64 GB
8 GB
OK OK OK -
16 GB
OK OK OK -
32 GB
OK OK OK OK
64 GB
- - OK OK
Figure 2-4 shows all memory installation locations. Groups a to d represent memory installation units. Table 2-2 lists the supported memory installation configurations. Memory for group B cannot be installed until no more memory can be installed for group A.
When configuring memory mirroring, install all the memory in group A or group B. A combination of mirrored memory is a unit of eight modules as shown in Figure 2-4.
For example, in the memory on the right side of CPU#0 in Figure 2-4, the four-module set of MEM#00B, MEM#00A, MEM#01B, and MEM#01A mirrors the four-module set of MEM#10B, MEM#10A, MEM#11B, and MEM#11A.
Figure 2-4  Memory Installation Locations and Units
Figure 2-4  Memory Installation Locations and Units
Table 2-2  Memory Installation Configurations
Memory Module Count Installed Memory
4 a in Figure 2-4 - - -
8 a in Figure 2-4 b in Figure 2-4 - -
16 a in Figure 2-4 b in Figure 2-4 c in Figure 2-4 d in Figure 2-4