Lenovo ThinkSystem SR650 Series Setup Manual page 148
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Table 12. Mirroring mode with two processors
Total
DIMMs 24 23 22 21 20 19 18 17 16 15 14 13
4
5
6
7
8
22
9
10
22
12
24
22
13
22
14
22 21 20 19 18 17 16 15
15
24
22
16
22 21 20 19 18 17 16 15
17
22 21 20 19 18 17 16 15
18
24
22
20
22 21 20 19 18 17 16 15
21
24
22
24
24 23 22 21 20 19 18 17 16 15 14 13
Rank sparing mode
In rank sparing mode, one rank of a memory module works as the spare rank for the other ranks on the same
channel. The spare rank is not available as system memory.
Notes:
• All memory modules to be installed must be the same type with the same capacity, frequency, voltage,
and ranks.
• If the rank of installed memory modules is one rank, follow the installation rules listed in the following
tables. If the rank of installed memory modules is more than one rank, follow the installation rules of
independent mode.
The following table shows the memory module population sequence for rank sparing mode when only one
processor (Processor 1) is installed.
Table 13. Rank sparing mode with one processor
Total
DIMMs
12
11
2
4
6
8
144
ThinkSystem SR650 Setup Guide
Processor 2
17
15
17
15
17
15
17
15
20
17
15
17
15
20
17
15
20
17
15
20
17
15
20
17
15
20
18 17 16 15 14 13
20
18 17 16 15 14 13
10
9
8
8
8
10
9
8
12 11 10
9
8
13
13
10
8
10
8
13
12
10
8
12
10
8
13
12
10
8
12
10
8
12
10
8
13
12
10
8
10
9
8
12
10
8
12
10
8
12 11 10
9
8
12 11 10
9
8
12 11 10
9
8
Processor 1
7
6
5
6
5
7
6
5
7
6
5
7
6
5
Processor 1
7
6
5
4
3
2
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
6
5
4
3
2
5
3
6
5
4
3
2
7
6
5
4
3
6
5
4
3
2
6
5
4
3
2
7
6
5
4
3
2
7
6
5
4
3
2
7
6
5
4
3
2
4
3
2
4
3
4
3
Total
1 DIMMs
4
1
5
1
6
7
8
1
9
1
10
1
12
1
13
1
14
1
15
16
1
17
1
18
1
20
1
21
1
24
Total
1
DIMMs
2
4
6
8
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