CLI Guide

BIOS.MemSettings.MemOpMode (Read or Write)
Description
Allows the selection of the memory operating mode. Certain options are active only if a valid
memory configuration is detected. When the Optimizer Mode is enabled, the DRAM controllers operate
independently in 64-bit mode and provide optimized memory performance. When Advanced ECC Mode
is enabled, the two DRAM controllers are combined in 128-bit mode and provide optimized reliability.
Memory that cannot be teamed by the controllers is not reported to the Operating System. When Mirror
Mode is enabled, the system maintains two identical copies of data in the memory. This feature provides
maximum reliability and enables the system to continue running even during a high severity memory
failure. NOTE: In Mirror Mode, only half of the installed system memory is reported to the operating
system. When Spare Mode is enabled, the BIOS reserves a rank of memory as a spare. At runtime, the
memory controller can move a rank that exhibits a large number of correctable errors to the spare rank.
NOTE: In Spare Mode, the system memory size reported to the Operating System does not include the
spare portion. Spare with Advanced ECC Mode operates similarly to the Spare Mode. When this mode is
enabled, the system runs under Advanced ECC mode with a spare rank reserved in each channel. NOTE:
In Spare with Advanced ECC Mode, the system memory size reported to the Operating System does
not include the spare portion. When Dell Fault Resilient Mode is enabled, the BIOS establishes an area of
memory that is fault resilient. This mode can be used by an Operating System that supports the feature to
load critical applications or enables the Operating System kernel to maximize system availability. Default:
Optimizer Mode
For FRM, need platform to support Mirror mode. For NUMA FRM, need to have 2 CPU installed +
platform support Mirror mode. [MirrorMode, Lockstep] Needs identical memory configurations in channles
behind each memory controller.
Legal Values
● OptimizerMode
● SingleRankSpareMode
● MultiRankSpareMode
● SpareMode
● MirrorMode
● AdvEccMode
● SpareWithAdvEccMode
● FaultResilientMode
● NUMAFaultResilientMode
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
BIOS.MemSettings.MemOptimizer (Read or Write)
Description
When set to Disabled, the two DRAM controllers are combined in 128-bit mode and provide optimized
reliability with Advanced ECC Mode. When set to Enabled, the two DRAM controllers operate
independently in 64-bit mode and provide optimized performance without Advanced ECC Mode. Default:
Disabled
Has a dependency on DIMM population where corresponding channnels for each socket (Channel0 and
Channel2, Channel1 and Channel 3) needs to be populated and populated idenditally. Not used on 13G+.
Legal Values
● Enabled
● Disabled
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
208 BIOS Attributes