1. Installing / Removing Internal Options
Occurrence of Rank Sparing error (When the different DIMMs are used for failing rank and spare rank)
This feature can be used under the following conditions:
• Both DIMMs in Lock Step Pair (DIMM#1/2, DIMM#3/4, DIMM#5/6, DIMM#7/8) must be of same model.
• Each memory channel must have two or more DIMMs or 3Rank or higher rank.
(6) LockStep + Mirroring
In LockStep + Mirroring mode, mirroring memory is added to Lock Step mode, and regularly copies the contents
of memory onto mirroring memory. If the memory error is detected, the mirroring memory takes over to continue
processing.
Mirroring is performed between SMI channels in memory controller, as shown in the figure below. In principle,
the SMI channel having younger number (SMI0) is defined as duplication origin.
RAS feature is higher than LockStep mode and LockStep + Rank Sparing mode, however, the memory capacity
available for OS is reduced to half of installed memory capacity.
• Combinations of channels 0 and 1, and 2 and 3 are used in .Lock Step + Mirroring
mode.
• Use NE3302-H030F/H031F/H032F/H033F additional memory for Step + Mirroring
mode.
• Use the DIMMs of same model for Lock Step PAIR and Mirroring PAIR.
running system
system
(spare rank)
PAIR#1-2
PAIR#1-3
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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