NEC express5800 A2010b - Page 201

1. Installing / Removing Internal Options
Chapter 2 Preparations
This feature can be used under the following conditions:
• The four DIMMs used for Lock Step Pair and Mirroring Pair between SMI channel must be of the same
model.
(7) Memory Scrubbing
The server provides the patrol scrubbing and demand scrubbing features.
• Patrol scrubbing feature
This feature checks system memory regularly. If a correctable error such as single-bit error is detected,
correct it and write back that data to memory to keep the memory in errorless condition.
• Demand scrubbing feature
This feature checks memory during operation. If a correctable error such as single-bit error is detected,
correct it and write back that data to memory to keep the memory in errorless condition.
By correcting an error in advance can reduce the occurrence of uncorrectable error.
DIMM #1
DIMM #5
DIMM #2
DIMM #6
CH0
CH1
SMI0
SMI2
SMI3
LockStep
PAIR#1
LockStep
PAIR#3
DIMM #3
DIMM #7
DIMM #4
DIMM #8
CH2
CH3
SMI1
LockStep
PAIR#2
LockStep
PAIR#4
Memory Riser #1
Memory memory
Memory Buffer #1
Memory Buffer #2
Memory Controller #1
Memory Controller #2
Processor
Mirroring
PAIR #1
Mirroring
PAIR #2
Express5800/A1040b, A2040b, A2020b, A2010b User's Guide
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