Lenovo ThinkSystem SR550 - Trademarks

Table 12. Independent mode with two processors (continued)
Total
memory
modules
Processor 2 Processor 1 Total
memo-
ry
mod-
ules
12 11 10 9 8 7 6 5 4 3 2 1
11 11 10 9 8 7 6 5 4 3 2 1 11
12 12 11 10 9 8 7 6 5 4 3 2 1 12
Mirroring mode
In mirroring mode, each memory module 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 memory modules to be installed must be the same type with the same capacity, frequency,
voltage, and rank.
The following table shows the memory module population sequence for mirroring mode when one processor
(CPU1) is installed.
Table 13. Mirroring mode with one processor
Total
memory
modules
Processor 1 Total
memory
modules
6 5 4 3 2 1
2 3 2 2
3 3 2 1 3
4 5 4 3 2 4
6 6 5 4 3 2 1 6
The following table shows the memory module population sequence for mirroring mode when two
processors (CPU1 and CPU2) are installed.
Table 14. Mirroring mode with two processors
Total
memory
modules
Processor 2 Processor 2 Total
memo-
ry
mod-
ules
12 11 10 9 8 7 6 5 4 3 2 1
4 9 8 3 2 4
5 9 8 3 2 1 5
6 9 8 7 3 2 1 6
8 11 10 9 8 5 4 3 2 8
9 9 8 7 6 5 4 3 2 1 9
10 11 10 9 8 6 5 4 3 2 1 10
12 12 11 10 9 8 7 6 5 4 3 2 1 12
60 ThinkSystem SR550 Setup Guide