Lenovo ThinkSystem SR950 - Page 110

Installation order: memory mirroring with four processors
Memory module installation order for memory mirroring with four processors installed in the server.
The following tables show the DIMM population sequence for memory mirroring when four processors are
installed.
• Processors 1 and 2 are installed in the lower system board of the lower compute tray.
• Processors 3 and 4 are installed in the upper system board of the lower compute tray or in the upper
compute tray.
Note: When adding one or more DIMMs during a memory upgrade, you might need to move other DIMMs
that are already installed to new locations.
Table 83. Memory mirroring with four processors (Processors 1 and 2, 8 to 24 total DIMMs installed in server)
Total Processor 1 Processor 2 Total
DIMMs 1 2 3 4
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 DIMMs
8 8 10 20 22 8
9 8 10 12 20 22 9
10 8 10 12 20 22 10
11 8 10 12 20 22 24 11
12 8 10 12 20 22 24 12
13 3 5 8 10 20 22 24 13
14 3 5 8 10 20 22 24 14
15 3 5 8 10 15 17 20 22 15
16 3 5 8 10 15 17 20 22 16
17
17 DIMM memory mirroring configuration is not
supported.
17 DIMM memory mirroring configuration is not
supported.
17
18 1 3 5 8 10 12 15 17 20 22 18
19 19 DIMM memory mirroring configuration is not
supported.
19 DIMM memory mirroring configuration is not
supported.
19
20 1 3 5 8 10 12 15 17 20 22 20
21 1 3 5 8 10 12 13 15 17 20 22 24 21
22 1 3 5 8 10 12 13 15 17 20 22 24 22
23 23 DIMM memory mirroring configuration is not
supported.
23 DIMM memory mirroring configuration is not
supported.
23
24 1 3 5 8 10 12 13 15 17 20 22 24 24
Related DIMM population sequences for four processor systems:
• Processor 1 and 2 DIMM population sequences for 25 to 48 DIMMs, see Table 84 “Memory mirroring with
four processors (Processors 1 and 2, 25 to 48 total DIMMs installed in server)” on page 107.
• To continue populating processor 3 and 4 DIMMs for a system with 8 to 24 DIMMs, see Table 85 “Memory
mirroring with four processors (Processors 3 and 4, 8 to 24 total DIMMs installed in server)” on page 108.
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ThinkSystem SR950 Setup Guide