Dell EMC PowerEdge R740 Installations- Und Servicehandbuch Seite 106

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.
ANMERKUNG: Processor 1 and processor 2 population should match.
Tabelle 49. Memory population rules
Processor Configuration
Single processor Optimizer (Independent
channel) population order
Mirror population order
106 Installieren und Entfernen von Systemkomponenten
Description
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).
ANMERKUNG:
be enabled in the BIOS menu of System Setup.
ANMERKUNG:
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.
Memory population
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12
{1, 2, 3, 4, 5, 6} {7, 8, 9, 10,
11, 12}
To use memory sparing, this feature must
Memory sparing does not offer
Memory population information
• DIMMs must be populated in the order
specified.
• Odd number of DIMM population is allowed
ANMERKUNG: 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, A10,
A11
Mirroring is supported with 6 or 12 DIMMs per
processor.