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14.1.1 Overview of Memory Mirroring

14.1.1 Overview of Memory Mirroring
The SPARC M12/M10 supports memory mirroring configurations to protect data through memory duplication. Data reliability increases, but the available memory capacity is halved.

The memory access controller controls writing of data to memory and reading of data from memory. The SPARC M12/M10 configures the mirroring by grouping the memory into sets controlled by two memory access controllers.
Note - The memory grouped together in a mirroring configuration must all have the same capacity and be the same rank.
For the rules on the physical configuration of memory, see "Checking the Memory Configuration Rules" in the Service Manual for your server.