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 memory modules to be installed must be the same type with the same capacity, frequency,
voltage, and number of ranks.
The following table shows the DIMM population sequence for mirroring mode when only one processor
(CPU1) is installed.
Table 11. Mirroring mode with one processor
Total
Processor 1
Total
DIMMs
1
2
3
4
5
6
DIMMs
2
2
3
2
3
1
2
3
3
4
2
3
4
5
4
6
1
2
3
4
5
6
6
The following table shows the DIMM population sequence for mirroring mode when two processors (CPU1
and CPU2) are installed.
Table 12. Mirroring mode with two processors
Total
Processor 1
Processor 2
Total
DIMMs
1
2
3
4
5
6
7
8
9
10
11
12
DIMMs
4
2
3
10
11
4
5
1
2
3
10
11
5
6
1
2
3
10
11
12
6
8
2
3
4
5
8
9
10
11
8
9
1
2
3
4
5
6
10
11
12
9
10
1
2
3
4
5
6
8
9
10
11
10
12
1
2
3
4
5
6
7
8
9
10
11
12
12
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, rank sparing mode is not supported. If the rank of installed
DIMMs is more than one rank, follow the installation rules listed in the following tables.
The following table shows the DIMM population sequence for rank sparing mode when only one processor
(CPU1) is installed.
.
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Summary of Contents for ThinkSystem ST550
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