Table 13. Mirroring 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
8 22 20 17 15 10 8 5 3 8
9 17 15 13 12 10 8 5 3 1 9
10 22 20 17 15 12 10 8 5 3 1 10
12 24 22 20 17 15 13 12 10 8 5 3 1 12
13 22 20 17 15 12 10 8 6 5 4 3 2 1 13
14 22 21 20 19 18 17 16 15 12 10 8 5 3 1 14
15 24 22 20 17 15 13 12 10 8 6 5 4 3 2 1 15
16 22 21 20 19 18 17 16 15 10 9 8 7 6 5 4 3 16
17 22 21 20 19 18 17 16 15 12 10 8 6 5 4 3 2 1 17
18 24 22 20 17 15 13 12 11 10 9 8 7 6 5 4 3 2 1 18
20 22 21 20 19 18 17 16 15 12 11 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
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
Rank sparing mode
In rank sparing mode, one rank of a DIMM works as the spare rank for the other ranks on the same channel.
The spare rank is not available as system memory.
Notes:
• All DIMMs to be installed must be the same type with the same capacity, frequency, voltage, and ranks.
• If the rank of installed DIMMs is one rank, follow the installation rules listed in the following tables. If the
rank of installed DIMMs is more than one rank, follow the installation rules of independent mode.
The following table shows the DIMM population sequence for rank sparing mode when only one processor
(CPU1) is installed.
Table 14. Rank sparing mode with one processor
Total Processor 1 Total
DIMMs
12 11
10 9 8
7
6 5
4
3
2 1
DIMMs
2 6 5 2
4 8 7 6 5 4
6 8 7 6 5 4 3 6
8 10 9 8 7 6 5 4 3 8
10 10 9 8 7 6 5 4 3 2 1 10
12 12 11 10 9 8 7 6 5 4 3 2 1 12
The following table shows the DIMM population sequence for rank sparing mode when two processors
(CPU1 and CPU2) are installed.
Chapter 3. Hardware replacement procedures 137
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