NEC Express5800/R120g-2M User Manual page 64

Chapter 2 Preparations
Memory Mirroring feature can be used under the following conditions:

Install DIMMs in DIMM slots to configure a mirror set.

All the installed DIMMs should have the same capacity.

Run BIOS Setup Utility (SETUP), change parameters as shown below, save the settings, and exit.
Advanced  Memory Configuration  Memory RAS Mode  Mirroring
Server  Power Measurement Policy  One Time

After restart, run SETUP again, and check if "Mirrored" is displayed for the following parameter.
Advanced  Memory Configuration  Memory Information  CPUx_DIMMx Status

Installation order depends on CPU configuration. See the figure below.
1CPU 構成 1CPU 2CPU 構成 2CPU
configuration 搭載順序 configuration 搭載順序
2 3
4 7
6 11
2 3
4 7
6
11
5 9
3 5
1 1
5 9
3 5
1 1
4
8
12
4
8
12
10
6
2
10
6
2
Memory Mirroring cannot be configured in the following case:

Memory Mirroring within the same memory channel
Notes on Configuring Memory Mirroring
In Memory Mirroring configuration, Memory RAS Mode menu is changed from "Mirroring" to "Independent" in
the following cases:

When you additionally install DIMMs that unable to configure Memory Mirroring

When you remove DIMMs that takes down Memory Mirroring
64
CPU1_DIMM 3
CPU1_DIMM 7
CPU1_DIMM 11
CPU1_DIMM 4
CPU1_DIMM 8
CPU1_DIMM 12
CPU1_DIMM 10
CPU1_DIMM 6
CPU1_DIMM 2
CPU1_DIMM 9
CPU1_DIMM 5
CPU1_DIMM 1
CPU2_DIMM 3
CPU2_DIMM 7
CPU2_DIMM 11
CPU2_DIMM 4
CPU2_DIMM 8
CPU2_DIMM 12
CPU2_DIMM 10
CPU2_DIMM 6
CPU2_DIMM 2
CPU2_DIMM 9
CPU2_DIMM 5
CPU2_DIMM 1
Express5800/R120g-2M User's Guide
1. Installing Internal Optional Devices