Dell EMC E39S Series Installation And Service Manual page 97

Table 54. Memory operating modes (continued)
Memory Operating Mode
Single Rank Spare Mode
Multi Rank Spare Mode
Dell Fault Resilient Mode
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.
• Quad processor: Populate the slots in round robin sequence starting with processor 1.
NOTE: Processor 1, processor 2, processor 3, and processor 4 population should match.
Table 55. Memory population rules
Processor Configuration
Single processor Optimizer (Independent
channel) population order
Description
Mirror Mode require that the memory modules be identical in size,
speed, and technology, and they must be populated in sets of 6 per
processor.
Single Rank Spare Mode allocates one rank per channel as a
spare. If excessive correctable errors occur in a rank or channel,
while the operating system is running, they are moved to the spare
area to prevent errors from causing an uncorrectable failure.
Requires two or more ranks to be populated in each channel.
Multi Rank Spare Mode allocates two ranks per channel as a
spare. If excessive correctable errors occur in a rank or channel,
while the operating system is running, they are moved to the spare
area to prevent errors from causing an uncorrectable failure.
Requires three or more ranks to be populated in each channel.
With single rank memory sparing enabled, the system memory
available to the operating system is reduced by one rank per
channel.
For example, in a dual-processor configuration with 24x 16 GB
dual-rank memory modules, the available system memory is: 3/4
(ranks/channel) × 24 (memory modules) × 16 GB = 288 GB, and
not 24 (memory modules) × 16 GB = 384 GB. For multi rank
sparing, the multiplier changes to 1/2 (ranks/channel).
NOTE: To use memory sparing, this feature must be
enabled in the BIOS menu of System Setup.
NOTE: Memory sparing does not offer protection
against a multi-bit uncorrectable error.
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.
Memory population
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12
Installing and removing system components
Memory population information
• DIMMs must be populated in the order
specified.
• Odd number of DIMM population is allowed
NOTE: Odd number of DIMMs will
result in unbalanced memory
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