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Memory mirroring
Memory mirroring is roughly equivalent to
Port 1 | Port 2 |
Figure 1-12 Memory DIMMs are divided into two ports
When memory mirroring is enabled (see 4.1.2, “Enabling memory mirroring” on page 108), the data that is written to memory is stored in two locations. One copy is kept in the port 1 DIMMs, while a second copy is kept in the port 2 DIMMs. During the execution of the read command, the data is read from the DIMM with the least amount of reported memory errors through memory scrubbing.
If memory scrubbing determines the DIMM is damaged beyond use, read and write operations are redirected to the partner DIMM in the other port. Memory scrubbing then reports the damaged DIMM and the Light Path Diagnostics display the error. If memory mirroring is enabled, then the mirrored copy of the
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