Memory RAS Configuration Menu
Use this submenu to configure the memory mirroring, Reliability Availability Serviceability (RAS) settings.
Mirror Mode
Use this feature to configure the mirror mode settings for all 1LM/2LM memory modules in the system to create a duplicate copy of data stored in the memory to increase memory security. It will reduce the memory capacity into half. The options are Disabled and Full Mirror Mode.
Note: This feature is available when "UEFI ARM Mirror" is set to Disabled.
UEFI ARM Mirror
If this feature is set to Enabled, 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 Disabled and Enabled. The Address Range Mirroring (ARM) feature supports partial memory mirroring. This feature is CPU-dependent.
Note: This feature is available when "Mirror Mode" is set to Disabled.
Mirror TAD0
Use this feature to enable the mirror mode on the entire memory for Target Address Decoder 0 (TAD0). The options are Disabled and Enabled. This feature is CPU-dependent.
Note: This feature is available when "Mirror Mode" is set to Disabled.
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 512.
Note: This feature is available when "Memory PFA Support" is set to Disabled.
DDR PPR Type
Post Package Repair (PPR) is a new feature available for the DDR4/DDR5 technology. PPR provides additional spare capacity within a DDR4/DDR5 DRAM module that is used to replace faulty cell areas detected during system boot. PPR offers two types of memory repairs. Soft Post Package Repair (sPPR) provides a quick, temporary fix on a raw element in a bank group of a DDR4/DDR5 DRAM device, while hard Post Package Repair (hPPR) will take a longer time to provide a permanent repair on a raw element. The options are PPR Disabled, Hard PPR, and Soft PPR.
Enhanced PPR
Use this feature to set advanced memory test. Select Enabled to always execute for every boot. The options are Disabled, Enabled, and Persistent.
Memory PFA Support (Available when the DCMS key is activated)
Select Enabled to enable memory Predictive Failure Analysis (PFA) support. PFA can be used to avoid uncorrectable faults on the same memory page. The options are Disabled and Enabled.