NEC Express5800 120Li, User Manual

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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.
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