Mirror Configuration

On this menu, you can manage and configure memory mirroring settings.

Table 1. Mirror Configuration
Item	Options	Description
Mirror Fail-over	Disabled Enabled (Default)	Enabled/Disabled Mirror Fail-over. One persistent memory uncorrectable error will trigger mirror failover when the item is enable. Skip mirror failover even persistent uncorrectable error happens when the items is disabled. This item only takes effect when Full Mirror or Partial Mirror is enabled. Note This item is not supported if it’s HBM sku.
Configuration Made From OS	N/A	Display the memory mirror configuration that was defined by the OS utility. When a definition is found, you can use Delete Configuration Made From OS to clear it.
Mirror Below 4GB	None	Display the mirroring configuration of memory below 4 GB. Note The option may be [TRUE] or [FALSE] after the OS has configured memory mirroring.
Partial Mirror Ratio In Basis Points	None	Display the mirroring ratio for the memory above 4GB in basis points. Mirror options are 5%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%, which respectively represents 500, 1000, 1500, 2000, 2500, 3000, 3500, and 4000. Any other numbers entered will be rounded to the nearest greater number. For example, if a number is greater than 2000 but less than or equal to 2500 (that is, 2000 < number <=2500), it will be rounded to 2500. Numbers greater than 4000 (> 4000) will be rounded to 4000. Note The option may be a value within the range of 1 – 5000 after the OS has configured memory mirroring. This item is not available for Intel Xeon 6 processors (formerly codenamed "Sierra Forest").
Configuration Made From UEFI	N/A	Display the memory mirror configuration that was defined by the UEFI Setup utility. If a value defined by the UEFI Setup utility conflicts with that defined by the OS, the value defined by the OS will take precedence.
Full Mirror	Disabled (Default) Enabled	Full mirroring reduces the available system memory by half of the total installed memory. This setting is [Disabled] and grayed out when ADDDC Sparing or Partial Mirror is [Enabled]. Note This setting will be grayed out when “Memory Mode” in CXL Memory Module is “Heterogeneous Interleave”. To enable this setting, need to make sure that “Memory Mode” in CXL Memory Module is set to “1LM + Vol”.
Partial Mirror	Disabled (Default) Enabled	Partial mirroring reduces the available system memory by percentage of up to 40% per processor. The percentage is set by Partial Mirror Ratio In Basis Points. This setting is [Disabled] and grayed out when ADDDC Sparing or Full Mirror is [Enabled]. Note This item is not available for Intel Xeon 6 processors (formerly codenamed "Sierra Forest"). This setting will be grayed out when “Memory Mode” in CXL Memory Module is “Heterogeneous Interleave”. To enable this setting, need to make sure that “Memory Mode” in CXL Memory Module is set to “1LM + Vol”.
Mirror Below 4GB	Disabled (Default) Enabled	When this option is enabled, all available system memory below the 4 GB address limit will be mirrored; typically 1 GB to 3 GB. Note This item is not available for Intel Xeon 6 processors (formerly codenamed "Sierra Forest").
Partial Mirror Ratio In Basis Points	Value range: 1 – 4000 200 (Default)	Configure the mirroring ratio for the memory above 4GB in basis points. Mirror options are 5%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%, which respectively represents 500, 1000, 1500, 2000, 2500, 3000, 3500, and 4000. Any other numbers entered will be rounded to the nearest greater number. For example, if a number is greater than 2000 but less than or equal to 2500 (that is, 2000 < number <= 2500), it will be rounded to 2500. Numbers greater than 4000 (> 4000) will be rounded to 4000. Note This item is not available for Intel Xeon 6 processors (formerly codenamed "Sierra Forest").

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