1. Installing / Removing Internal Options
(5) Lock Step + Rank Sparing
In Lock Step + Rank Sparing mode, spare ranks are added to Lock Step mode. If the indication of failure is
detected in running rank, replace the data in unit of Lock Step PAIR by copying it onto spare rank on the same
channel to continue processing.
RAS feature is higher than Lock Step mode, however, the memory capacity available for OS is reduced by the
capacity of spare rank from the installed memory.
• Combinations of channels 0 and 1, and 2 and 3 are used for Lock Step+RankSparing
mode.
• Use NE3302-H020F/H021F/H022F/H023F additional memory for Lock
Step+RankSparing mode.
• Use the DIMMs of same model for Lock Step PAIR.
Occurrence of Rank Sparing error (When the same DIMMs are used for failing rank and spare rank)
Memory Buffer #1 Memory Buffer #2
system
(spare rank)
running system
PAIR#1-2
PAIR#1-3
PAIR#2-2
PAIR#2-3
PAIR#3-2
PAIR#3-3
PAIR#4-2
PAIR#4-3
PAIR#1-2
PAIR#1-3
system
system
PAIR#3-2
PAIR#3-3
PAIR#2-2
PAIR#2-3
PAIR#4-2
PAIR#4-3
Express5800/A1040b, A2040b, A2020b, A2010b User's Guide
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