1. Installing Internal Optional Devices
Express5800/R120d-2M User’s Guide
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Chapter 2 Preparations
(1)
Memory Mirroring Feature
Memory Mirroring feature writes the same data into two groups of DIMMs (mirror set) corresponding with each
other between memory channels (channels 0 and 1 or channel 2 and 3) to provide data redundancy.
Note
•
Memory Mirroring feature uses channels 0 and 1 or channels 2 and 3.
•
To use Memory Mirroring feature, install N8102-472/473/474/475 additional memory
board (two DIMMs of same model).
•
DIMMs to be installed in mirror set must have same capacity.
Example: 2-CPU configuration
Tips
The operating system only recognizes a half of the total physical capacity.
Memory controller
Memory controller
Mirror set
#9
Mirror set
#5
Mirror set
#1
Mirror set
#11
Mirror set
#7
Mirror set
#3
Mirror set
#12
Mirror set
#8
Mirror set
#4
Mirror set
#10
Mirror set
#6
Mirror set
#2
Data 1
Data 2
Data 3
Data 4
Data 1
Data 2
Data 3
Data 4
