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XH321L V5 Server Node V100R005 Maintenance and Service Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
DIMM Ranks

DIMM Ranks

To understand and configure memory protection modes properly, it is helpful to learn about single-rank, dual-rank, and quad-rank DIMMs. Some DIMM configuration requirements are based on these classifications.

  • A single-rank DIMM has one set of memory chips that is accessed while data is written to or read from the memory.
  • A dual-rank DIMM has two single-rank DIMMs on the same module, with only one rank accessible at a time.
  • A quad-rank DIMM has two dual-rank DIMMs on the same module, with only one rank accessible at a time.

The server memory control subsystem selects a proper rank within the DIMM when data is written to or read from the DIMM.

Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For example, if the current DRAM technology supports 8 GB single-rank DIMMs, a dual-rank DIMM can offer a capacity of 16 GB and a quad-rank DIMM can offer a capacity of 32 GB.

LRDIMMs are labeled as quad-rank DIMMs. There are four ranks of DRAM on the DIMM, but the LRDIMM buffer creates an abstraction that allows the DIMM to appear as a logical dual-rank DIMM to the system. The LRDIMM buffer also isolates the electrical loading of the DRAM from the system to allow for faster operation. These two changes provide a higher memory operating speed compared with quad-rank RDIMMs.

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Updated: 2019-01-08

Document ID: EDOC1100033003

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