NEC Express5800/T120a-E N8100-1531F, User Manual, Page: 391 / 542

Upgrading Your Server 9-45
Memory Mirroring
The memory mirroring feature writes the same data into two groups of DIMMs corresponding with
each other between memory channels (channels 0 and 1) to provide data redundancy.
IMPORTANT:
The memory mirroring feature uses channels 0 and 1.
In memory mirroring configuration, the memory channel 2 of each
CPU (CPU1-DIMM3/6, CPU2-DIMM3/6) is disabled.
Memory controller
Mirror set
#3
Mirror set
#1
Mirror set
#4
Mirror set
#2
Memory controller
NOTE:
The operating system only recognizes a half of the total
physical capacity.
The memory mirroring feature can be used under the following conditions:
„
Install memory devices on two memory sockets configuring a mirror set.
„
All the installed memory devices should have the same capacity.
„
Run SETUP (see Chapter 4), change parameters appropriately in the [Mirror] menu
selected as shown below, save the settings and exit from SETUP.
[Advanced] → [Memory Configuration] → [Memory RAS Mode] → [Mirror]
CH0 CH1
Data 1
Data 2
Data 3
Data 4 Data 1
Data 2
Data 3
Data 4
Example:
In 2-CPU
configuration