Deployment Guide

System BIOS
11 Setting up BIOS on 15th Generation (15G) Dell EMC PowerEdge Servers | 508
Menu Item
Options
Description
System Memory Testing
• Enabled
• Disabled
Specifies whether the BIOS software-based system
memory tests are conducted during POST.
When set to Enabled, the memory tests are performed,
and test results are displayed on the screen.
Note: Enabling results in a longer boot time. The extent of
the increase depends on the amount of memory installed
in the system.
Note: This memory test is different from the hardware-
based memory test which is built-in in the chipset
(MBIST). MBIST is performed on every boot.
Dram Refresh Delay
• Performance
• Minimum
By enabling the CPU memory controller to delay running
the REFRESH commands, you can improve the
performance for some workloads. By minimizing the
delay time, it is ensured that the memory controller runs
the REFRESH command at regular intervals. For Intel-
based servers, this setting only affects systems
configured with DIMMs which use 8 Gb density DRAMs.
Memory Operating Mode
• Optimizer
Mode
• Dell Fault
Resilient
Mode
This field selects the memory operating mode. This
feature is active only if a valid memory configuration is
detected.
When Optimizer Mode is enabled, the DRAM controllers
operate independently in 64-bit mode and provide
optimized memory performance.
When Dell Fault Resilient Mode (FRM) is enabled, a
percentage of the total installed memory is configured to
create a fault resilient zone starting from lowest system
memory address for use by select hypervisors for host
virtualization resilience. Specify the FRM percentage by
using the Fault Resilient Mode Memory Size[%] feature.
When Dell NUMA Fault Resilient Mode (FRM) is enabled,
a percentage of the installed memory in every NUMA
node is configured to create a fault resilient zone for use
by select hypervisors for host virtualization resilience.
Specify the FRM percentage by using the Fault Resilient
Mode Memory Size[%] feature.
Current State of Memory
Operating Mode
Read-only. Indicates the current state of the memory
operating mode. This can differ from the Memory
Operating Mode field if the requested mode cannot be
achieved.
Fault Resilient Mode
Memory Size[%]
• 25
• 12.5
Select to define the percent of total memory size that
must be used by the fault resilient mode, when selected
in the Memory Operating mode. When Fault Resilient
Mode is not selected, this option is grayed out and not
used by Fault Resilient Mode.
Memory Interleaving
• Auto
• Disabled
When Enabled, memory interleaving is supported if a
symmetric memory configuration is installed. When set
to Disabled, the system supports Non-Uniform Memory
Access (NUMA) (asymmetric) memory configurations.