NEC Express5800 Series User Manual page 67

Chapter 2 Preparations
Memory Mirroring feature can be used under the following conditions:

Install DIMMs in two DIMM sockets configuring a mirror set.

All the installed DIMMs should have the same capacity.

See Chapter 2 (1. System BIOS) in "Maintenance Guide", run SETUP, change parameters as shown
below, save the settings, and exit from SETP.
Advanced  Memory Configuration  Memory RAS Mode: Change to Mirroring.

After restart, run SETUP again, and check if "Mirrored" is displayed for the following parameter.
Advanced  Memory Configuration  Memory Information  CPUx_DIMMx Status

Memory Mirroring feature cannot be used together with the Memory Lock Step feature.

Installation order depends on CPU configuration. See the figure below.
2-CPU
configuration
4th set
8th set
4th set
8th set
1st set
5th set
1st set
5th set
6th set
2nd set
6th set
2nd set
7th set
3rd set
7th set
3rd set
CPU1_DIMM1
CPU1_DIMM2
CPU1_DIMM3
CPU1_DIMM4
CPU1_DIMM5
CPU1_DIMM6
CPU1_DIMM7
CPU1_DIMM8
CPU2_DIMM1
CPU2_DIMM2
CPU2_DIMM3
CPU2_DIMM4
CPU2_DIMM5
CPU2_DIMM6
CPU2_DIMM7
CPU2_DIMM8
Memory Mirroring cannot be configured in the following case:

Memory Mirroring within a specific memory channel
DIMM installation order
Slot
1-CPU configuration
1
1
2
2
3
3
4
4








Express5800/T120g User's Guide
1. Installing Internal Optional Devices
1-CPU
configuration
1st set
3rd set
1st set
3rd set
4th set
2nd set
4th set
2nd set
2-CPU configuration
1
1
3
3
5
5
7
7
2
2
4
4
6
6
8
8
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