NEC Express5800/T120d User Manual page 70

Chapter 2 Preparations
(1) Memory Mirroring Feature
Memory Mirroring feature writes the same data into two groups of DIMMs corresponding with each other
between memory channels (channels 2 and 3) to provide data redundancy.
Example: 2-CPU configuration
70
• Memory Mirroring feature uses channels 2 and 3. In Memory Mirroring configuration, the
Note
memory channel 1 of each CPU (CPU1-DIMM1/4, CPU2-DIMM1/4) is disabled.
• To use Memory Mirroring feature, install N8102-483/484/485 additional memory board
(two DIMMs of same model).
• Any other memory board than N8102-483/484/485 cannot be installed together.
• To use Memory Mirroring feature in 2-CPU configuration, install two sets of 483/484/485
additional memory board (four DIMMs of same model).
Memory controller
Memory controller
Tips
The operating system only recognizes a half of the total physical capacity.
Express5800/T120d User's Guide
1. Installing Internal Optional Devices
Mirror set
#3
Mirror set
#1
Data 1 Data 1
Data 2 Data 2
Data 3 Data 3
Data 4 Data 4
Mirror set
#4
Mirror set
#2