NEC Express5800/R120e-2M User Manual page 72

Chapter 2 Preparations
1.13.7 Using Memory RAS Feature
This server has RAS feature including "Standard memory feature (x4 SDDC ECC memory)", "Memory
mirroring feature", "Lock Step feature (x8 SDDC ECC memory)", and Memory Sparing feature. SDDC (Single
Device Correction) allows automatic correction of memory error (multi-bit error).
The memory area on the motherboard of the server is divided into four memory channels.
Memory controller
Memory Mirroring, Memory Lock Step, and Memory Sparing features keep memory redundancy between
memory channels by monitoring or altering memory active/inactive status, respectively.
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• See List of features supported by additiional memory board in 1.13.3 Memory
Note
RAS Feature before using memory RAS feature.
• Only the features that additiional memory board support can be used.
Express5800/R120e-2M User's Guide
1. Installing Internal Optional Devices
Memory controller