DR4300 Owners Manual
Memory sparing
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memory modules in the sockets with white release tabs and 4 GB memory modules in the sockets with
black release tabs.
•
In a dual-processor configuration, the memory configuration for each processor should be identical. For
example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
•
Memory modules of different capacities can be mixed provided other memory population rules are followed
(for example, 4 GB and 8 GB memory modules can be mixed).
•
Mixing of more than two memory module capacities in a system is not supported.
•
Populate four memory modules per processor (one DIMM per channel) at a time to maximize performance.
Mode-specific guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on the memory
mode selected.
Advanced Error Correction Code (lockstep)
Advanced Error Correction Code (ECC) mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8
DRAMs. This protects against single DRAM chip failures during normal operation.
The installation guidelines for memory modules are as follows:
•
Memory modules must be identical in size, speed, and technology.
•
DIMMs installed in memory sockets with white release levers must be identical and the same rule applies
for sockets with black release levers. This ensures that identical DIMMs are installed in matched pair —for
example, A1 with A2, A3 with A4, A5 with A6, and so on.
Memory optimized (independent channel) 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.
Memory sparing
NOTE:
To use memory sparing, this feature must be enabled in System Setup.
In this mode, one rank per channel is reserved as a spare. If persistent correctable errors are detected on a rank,
the data from this rank is copied to the spare rank, and the failed rank is disabled.
With 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 sixteen 4 GB single-rank memory modules, the
available system memory is: 3/4 (ranks/channel) × 16 (memory modules) × 4 GB = 48 GB, and not 16 (memory
modules) × 4 GB = 64 GB.
NOTE:
Memory sparing does not offer protection against a multi-bit uncorrectable error.
NOTE:
Both Advanced ECC/Lockstep and Optimizer modes support memory sparing.
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