NEC Express5800/120Lj, User Manual

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Upgrading Your Server 9-89
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.
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 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
Mother board
Memory controller
Branch #0
Group #1
Pair of
mirroring
Branch #1
Pair of
mirroring
Pair of
mirroring
Group #3
Group #5
Group #2
Group #4
Group #6
Data1
Data2
Data3
Data4 Data1
Data2
Data3
Data4
Group #1 Group #2