Memory mirroring mode

Memory-mirroring mode provides full memory redundancy while reducing the total system memory capacity in half. Memory channels are grouped in pairs with each channel receiving the same data. If a failure occurs, the memory controller switches from the memory modules on the primary channel to the memory modules on the backup channel. The memory module installation order for memory mirroring varies based on the number of processors and memory modules installed in the server.

Population rules

With one processor

The following table shows memory population sequence of mirroring mode for one processor.

Table 1. Mirroring mode memory module population sequence for one processor
Processor Processor 1
Memory module slot number 1 2 3 4 5 6 7 8
Total memory module 8 1 2 3 4 5 6 7 8

With two processors

The following table shows memory population sequence of mirroring mode for two processors.

Table 2. Mirroring mode memory module population sequence for two processor
Processor Processor 1 Processor 2
Memory module slot number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Total memory module 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16