Dell PowerEdge XE2420 EMC Installation and Service Manual - Page 104

Optimizer Mode, Memory Operating Mode, Description, Dell Fault Resilient Mode, Processor

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Table 40. Memory operating modes (continued) Memory Operating Mode Dell Fault Resilient Mode Description The Dell Fault Resilient Mode if enabled, the BIOS creates an area of memory that is fault resilient. This mode can be used by an OS that supports the feature to load critical applications or enables the OS kernel to maximize system availability. NOTE: This feature is only supported in Gold and Platinum Intel processors. NOTE: Memory configuration has to be of same size DIMM, speed, and rank. Optimizer Mode This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not impose any specific slot population requirements. ● Dual processor: Populate the slots in round robin sequence starting with processor 1. NOTE: Processor 1 and processor 2 population should match. Table 41. Memory population rules Processor Configuration Single processor Optimizer (Independent channel) population order Mirror population order Single rank sparing population order Multi rank sparing population order Dual processor Optimized (Independent (Populate round robin channel) population order Memory population 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 {1, 2, 3, 4, 5, 6} 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 A{1}, B{1}, A{2}, B{2}, A{3}, B{3}... Memory population information ● Populate in this order, odd amount allowed. ● Odd number of DIMM population is allowed. NOTE: Odd number of DIMMs will result in unbalanced memory configurations, which in turn will result in performance loss. It is recommended to populate all memory channels identically with identical DIMMs for best performance. ● Optimizer population order is not traditional for 4 and 8 DIMM installations of single processor. ○ For 4 DIMMs: A1, A2, A4, A5 ○ For 8 DIMMs: A1, A2, A4, A5, A7, A8, A9, A10 Mirroring is supported with 6 DIMM slots per processor. Populate in this order, odd amount allowed. Requires two ranks or more per channel. Populate in this order, odd amount allowed. Requires three ranks or more per channel. ● Odd amount of DIMM slots per processor allowed. 104 Installing and removing system components

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Table 40. Memory operating modes (continued)
Memory Operating Mode
Description
Dell Fault Resilient Mode
The
Dell Fault Resilient Mode
if enabled, the BIOS creates
an area of memory that is fault resilient. This mode can be
used by an OS that supports the feature to load critical
applications or enables the OS kernel to maximize system
availability.
NOTE:
This feature is only supported in Gold and Platinum
Intel processors.
NOTE:
Memory configuration has to be of same size
DIMM, speed, and rank.
Optimizer Mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not
impose any specific slot population requirements.
●
Dual processor: Populate the slots in round robin sequence starting with processor 1.
NOTE:
Processor 1 and processor 2 population should match.
Table 41. Memory population rules
Processor
Configuration
Memory population
Memory population information
Single processor
Optimizer (Independent
channel) population order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
●
Populate in this order, odd
amount allowed.
●
Odd number of DIMM
population is allowed.
NOTE:
Odd number of
DIMMs will result in
unbalanced memory
configurations, which in
turn will result in
performance loss. It is
recommended to populate
all memory channels
identically with identical
DIMMs for best
performance.
●
Optimizer population order is
not traditional for 4 and 8
DIMM installations of single
processor.
○
For 4 DIMMs: A1, A2, A4, A5
○
For 8 DIMMs: A1, A2, A4,
A5, A7, A8, A9, A10
Mirror population order
{1, 2, 3, 4, 5, 6}
Mirroring is supported with 6
DIMM slots per processor.
Single rank sparing population
order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Populate in this order, odd amount
allowed. Requires two ranks or
more per channel.
Multi rank sparing population
order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Populate in this order, odd amount
allowed. Requires three ranks or
more per channel.
Dual processor
(Populate round robin
Optimized (Independent
channel) population order
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}...
●
Odd amount of DIMM slots per
processor allowed.
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Installing and removing system components