Table 11. Independent mode with two processors (continued)
Total Processor 2 Processor 1 Total
DIMMs 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 DIMMs
18 24 22 20 18 17 16 15 14 13 12 10 8 6 5 4 3 2 1 18
19 24 22 20 18 17 16 15 14 13 10 9 8 7 6 5 4 3 2 1 19
20 22 21 20 19 18 17 16 15 14 13 10 9 8 7 6 5 4 3 2 1 20
21 24 22 20 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 21
22 24 22 21 20 19 18 17 16 15 14 13 12 10 9 8 7 6 5 4 3 2 1 22
23 24 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 23
24 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 24
Mirroring mode
In mirroring mode, each DIMM in a pair must be identical in size and architecture. The channels are grouped
in pairs with each channel receiving the same data. One channel is used as a backup of the other, which
provides redundancy.
Note: All DIMMs to be installed must be the same type with the same capacity, frequency, voltage, and
ranks.
The following table shows the DIMM population sequence for mirroring mode when only one processor
(CPU1) is installed.
Table 12. Mirroring mode with one processor
Total Processor 1 Total
DIMMs 12 11 10 9 8 7 6 5 4 3 2 1 DIMMs
2
5 3 2
3
5 3 1 3
4 10 8 5 3 4
6 12 10 8 5 3 1 6
8 10 9 8 7 6 5 4 3 8
9 12 10 8 6 5 4 3 2 1 9
12 12 11 10 9 8 7 6 5 4 3 2 1 12
The following table shows the DIMM population sequence for mirroring mode when two processors (CPU1
and CPU2) are installed.
Table 13. Mirroring mode with two processors
Total Processor 2 Processor 1 Total
DIMMs 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 DIMMs
4 17 15 5 3 4
5 17 15 5 3 1 5
6 17 15 13 5 3 1 6
7 17 15 13 10 8 5 3 7
136 ThinkSystem SR650 Maintenance Manual
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