Memory mirrored channel

Memory mirrored channel mode replicates and stores data on two pairs of DIMMs within two channels simultaneously.

If a failure occurs, the memory controller switches from the primary pair of memory DIMMs to the backup pair of DIMMs. To enable memory mirrored channel through the Setup utility, select System Settings > Memory. For more information, see Using the Setup utility. When you use the memory mirrored channel feature, consider the following information:

The following diagram lists the DIMM connectors on each memory channel.

Figure 1. Connectors on each memory channel
Connectors on each memory channel

The following table shows the installation sequence for memory mirrored channel mode:

Table 1. Memory mirrored channel mode DIMM population sequence.

Number of DIMMs Number of installed microprocessor DIMM connector
First pair of DIMMs 1 1, 4
Second pair of DIMMs 1 9, 12
Third pair of DIMMs 1 2, 5
Fourth pair of DIMMs 1 8, 11
Fifth pair of DIMMs 1 3, 6
Sixth pair of DIMMs 1 7, 10
Seventh pair of DIMMs 2 13, 16
Eighth pair of DIMMs 2 21, 24
Ninth pair of DIMMs 2 14, 17
Tenth pair of DIMMs 2 20, 23
Eleventh pair of DIMMs 2 15, 18
Twelfth pair of DIMMs 2 19, 22
Table note: DIMM connectors 3, 6, 7, 10, 15, 18, 19, and 22 are not used in memory mirrored channel mode when UDIMMs are installed in the server.