Chapter 6: BIOS
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Memory RAS (Reliability_Availability_Serviceability) Conguration
Static Virtual Lockstep Mode
Select Enable to support Static Virtual Lockstep mode to enhance memory performance.
The options are Enable and Disable.
Mirror Mode
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.
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 enabled.
Correctable Error Threshold
Use this item to enter the threshold value for correctable memory errors. The default setting
is 10.
SDDC Plus One
Select Enable for SDDC (Single Device Data Correction) Plus One support, which will
increase the reliability and serviceability of your system memory. The options are Enable
and Disable.
ADDDC (Adaptive Double Device Data Correction) Sparing
Select Enable for ADDDC sparing support to enhance memory performance. The options
are Enable and Disable.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected in a memory module and send the corrections to the requestor (the original
source). When this item is set to Enable, the IO hub will read and write back one cache line
every 16K cycles if there is no delay caused by internal processing. By using this method,
roughly 64 GB of memory behind the IO hub will be scrubbed every day. The options are
Enable and Disable.
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