NEC 140He User Manual page 307

Memory Mirroring / Memory RAID Feature
Memory Mirroring Feature
The memory mirroring feature places a memory board as spare memory in standby state. If the current memory board
encounters an uncorrectable error, the memory mirroring feature switches to the standby memory board. When this
feature is used, the current memory board and the standby memory board should be combined. Available combinations
are:
Mirroring with memory boards 1 and 2
Mirroring with a pair of memory boards 1 and 2 and a pair of memory boards 3 and 4
To enable the memory mirroring feature, the combined memory boards must have DIMMs of same capacities.
The table below shows combinations of memory boards installed.
Memory board 1
A 2GB (1GB*2)
B 8GB (2GB*4)
C 4GB (1GB*4)
Memory RAID Feature
If one of the four memory boards encounters an uncorrectable error, the memory RAID feature switches to the other
memory board to continue operation. To use this feature, four memory boards must be installed. Each memory board
must have DIMMs of same capacities.
The table below shows combinations of memory boards installed.
Memory board 1
A 2GB (1GB*2)
B 8GB (2GB*4)
C 4GB (1GB*4)
Setting BIOS
Start SETUP and select [Advanced] → [Memory Configuration] → [Memory RAS Feature] and set as follows:
To enable the memory mirroring feature: Select [Mirror].
To enable the memory RAID feature: Select [RAID].
Memory board 2 Memory board 3
2GB (1GB*2) 2GB (1GB*2)
8GB (2GB*4) 8GB (2GB*4)
4GB (1GB*4)
Memory board 2 Memory board 3
2GB (1GB*2) 2GB (1GB*2)
8GB (2GB*4) 8GB (2GB*4)
4GB (1GB*4) 4GB (1GB*4)
Memory board 4
2GB (1GB*2)
8GB (2GB*4)
– –
Memory board 4
2GB (1GB*2)
8GB (2GB*4)
4GB (1GB*4)
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