Supermicro X11DAC User Manual page 85

Mirror Mode (Available when ADDDC Sparing set to Diable)
Use this feature to configure the mirror mode settings for all 1LM/2LM memory modules
installed in the system which will create a duplicate copy of data stored in the memory to
increase memory security, but it will reduce the memory capacity into half. The options are
Disable, Mirror Mode 1LM, and Mirror Mode 2LM.
UEFI ARM Mirror (Available when ADDDC Sparing set to Diable)
If this feature is set to Enable, mirror mode configuration settings for UEFI-based Address
Range memory will be enabled upon system boot. This will create a duplicate copy of data
stored in the memory to increase memory security, but it will reduce the memory capacity
into half. The options are Disable and Enable.
Memory Rank Sparing
Select Enable to support memory-rank sparing to optimize memory performance. The
options are Enable and Disable.
Note: This item will not be available when memory mirror mode is set to Mirror Mode
1LM or an AEP device is plugged in.
Correctable Error Threshold
Use this item to enter the threshold value for correctable memory errors. The default setting
is 512.
Intel Run Sure
Select Enable to use Intel Run Sure Technology which will enhance critical data protection
and increase system uptime and resiliency. The options are Enable and Disable.
SDDC Plus One (Available when this feature is supported by the CPU & the item:
Intel Run Sure is set to Disable)
SDDC (Single Device Data Correction) checks and corrects single-bit or multiple-bit (4-bit
max.) memory faults that affect an entire single x4 DRAM device. SDDC Plus One is the
enhanced feature to SDDC. SDDC+1 will spare the faulty DRAM device out after an SDDC
event has occurred. After the event, the SDDC+1 ECC mode is activated to protect against
any additional memory failure caused by a 'single-bit' error in the same memory rank. The
options are Disable and Enable*. (The option "Enable" can be set as default when it is
supported by the motherboard.)
ADDDC (Adaptive Double Device Data Correction) Sparing (Available when Intel
Run Sure is set to Enable)
Select Enable for Adaptive Double Device Data Correction (ADDDC) support, which will
not only provide memory error checking and correction but will also prevent the system
from issuing a performance penalty before a device fails. Please note that virtual lockstep
mode will only start to work for ADDDC after a faulty DRAM module is spared. The options
are Enable and Disable.
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Chapter 4: UEFI BIOS