1. Installing Internal Optional Devices
Express5800/R120h-1M User’s Guide
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Chapter 2 Preparations
(1) Memory Mirroring Function
Memory Mirroring Function is a function to generate redundancy by writing the same data into DIMM
group (mirror set) composed of three channels under the same memory controller (channel1, channel 2
and channel 3 or channel 4, channel 5 and channel 6).
Ex: Configuration with 2 CPUs
Tips
When Memory Mirroring Function is effective and "Memory Mirroring Mode" is set
to "Full Mirroring," total 50 % of available memory can be used from the operating
system.
The followings are the conditions to use this function.
●
Install 12 DIMMs per CPU.
●
Use DIMMs with the same product number for the device.
●
Change the following parameters and save them.
From System Utility, set "System Configuration > BIOS/Platform Configuration (RBSU) > System
Options > Memory Operations > Advanced Memory Protection" to "Mirrored Memory with Advanced
ECC Support".
●
After rebooting, confirm that "Advanced Memory Protection Mode : Memory Mirroring with Advanced
ECC" is displayed in POST.
Memory Controller 1
Memory Controller 2
Memory Controller 1
Mirror
Set
Mirror
Set
Data 1
Data 2
Data 4
Data 5
Data 1
Data 3
Data 4
Data 6
Data 2
Data 3
Data 5
Data 6
Mirror
Set
Mirror
Set
Mirror
Set
Mirror
Set
Mirror
Set
Mirror
Set
Memory Controller 2
