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Chapter 5: BIOS
Memory RAS Configuration
Static Virtual Lockstep Mode
Select Enable to run the system's memory channels in lockstep mode to minimize
memory access latency. The options are Disable and Enable.
Mirror Mode
This feature allows memory to be mirrored between two channels, providing 100%
redundancy. The options are Disable, Mirror Mode 1LM, and Mirror Mode 2LM.
Memory Rank Sparing
Select Enable to enable memory-sparing support for memory ranks to improve memory
performance. The options are Disable and Enable.
*If the feature above is set to Enable, Multi Rank Sparing will be available for
configuration:
Multi Rank Sparing
Use this feature to indicate how many memory ranks to reserve in case of memory
failure. The options are One Rank and Two Rank.
Correctable Error Threshold
Use this feature to specify the threshold value for correctable memory error logging,
which sets a limit on the maximum number of events that can be logged in the memory
error log at a given time. The default setting is 100.
SDDC
Single device data correction +1 (SDDC Plus One) organizes data in a single bundle
(x4/x8 DRAM). If any or all of the bits become corrupted, corrections occur. The x4
condition is corrected on all cases. The x8 condition is corrected only if the system is
in Lockstep Mode. The options are Disable and Enable.
ADDDC Sparing
Adaptive Double Device Data Correction (ADDDC) Sparing detects when the prede-
termined threshold for correctable errors is reached, copying the contents of the failing
DIMM to spare memory. The failing DIMM or memory rank will then be disabled. The
options are Disable and Enable.
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