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Chapter 2 Preparations
1.10.7 Using Memory RAS Feature
The server has RAS feature including Standard (Independent) Memory feature (x4 SDDC ECC memory),
Memory Mirroring feature, Memory LockStep (x8 SDDC ECC memory) feature and Memory Sparing
feature. SDDC (Single Device Data Correction) allows automatic correction of memory error (multi-bit
error).
The memory area on the motherboard of the server is divided into three memory channels.
The Memory Mirroring and Memory LockStep features keep memory redundancy between two memory
channels by monitoring or altering memory active/inactive status, respectively.
• To use the Memory Mirroring feature or Memory LockStep (x8 SDDC ECC memory)
Note
feature, additional memory board (N8102-493/494/495/496) is required.
• To use Memory Sparing feature, additional memory board (N8102-497/498) is required.
• To use Standard (Independent) memory feature (x4 SDDC), additional memory board
(N8102-489/490/491/492) is required.
Express5800/R120d-1E User's Guide
1. Installing Internal Optional Devices
67
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