Memory mirrored channel

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

In memory mirrored channel mode, the memory contents are mirrored between Channel 0 and Channel 1 and also between Channel 2 and Channel 3. As a result of the mirroring, the total physical memory available to the system is half of what is populated. Mirrored channel mode requires that Channel 0 and Channel 1, and Channel 2 and Channel 3 must be populated identically with regards to size and organization. DIMM slot populations within a channel do not have to be identical but the same DIMM slot location across Channel 0 and Channel 1 and across Channel 2 and Channel 3 must be populated the same.

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 table shows the installation sequence for memory mirrored channel mode:

Table 1. Memory mirrored channel mode DIMM population sequence.

Two column table documenting the number of installed microprocessor and DIMM connector population sequence for memory mirrored channel mode.

Number of installed microprocessor DIMM connector population sequence
One microprocessor installed 6, 8-> 1, 3-> 5, 7-> 2, 4
Two microprocessors installed 6, 8-> 9, 11-> 1, 3-> 14, 16-> 5, 7-> 10, 12-> 2, 4-> 13, 15