Memory Mirroring - NEC Express5800 120Li User Manual

9-58 Upgrading Your Server

Memory Mirroring

The memory mirroring feature writes the same data into two groups of DIMMs corresponding with
each other between memory branches (mirror set) to provide data redundancy.
Group #1 Group #2
Data1 Data1
Data2 Data2
Data3 Data3
Data4 Data4
NOTE:
physical capacity.
The memory mirroring feature can be used under the following conditions:
Install memory devices on four 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 Feature] → [Mirror]
Install memory devices in the following order:
Groups 1 and 2 → Groups 3 and 4 → Groups 5 and 6
The following mirroring cannot be configured:
Memory mirroring between different mirror sets
Memory mirroring within a specific memory branch
Pair of
mirroring
Pair of
mirroring
Pair of
mirroring
The operating system only recognizes a half of the total
Mother board
Memory controller
Branch #0
Group #1
Group #3
Group #5
Branch #1
Group #2
Group #4
Group #6