Parameter Specifications
l a: If the Cascade Lake processor is used, the rated speed and maximum operating speed
of the RDIMM can reach 2933 MT/s. If the Skylake processor is used, the rated speed
and maximum operating speed of a DDR4 memory module can reach 2666 MT/s only.
l b: The maximum number of DDR4 memory modules is based on dual-processor
configuration. The value is halved for a server with only one processor.
l c: The maximum DDR4 memory capacity varies depending on the processor type. The
value listed in this table is based on the assumption that twenty-four 128 GB DDR4
memory modules are configured.
2.3.4 Memory Installation Guidelines
l Observe the following when configuring DDR4 memory modules:
– Install memory modules only when corresponding processors are installed.
– Do not install LRDIMMs and RDIMMs in the same server.
– Install filler memory modules in vacant slots.
l Observe the following when configuring DDR4 memory modules in specific operating
mode:
– Memory sparing mode
n Comply with the general installation guidelines.
n Each memory channel must have a valid online spare configuration.
n The channels can have different online spare configurations.
n Each populated channel must have a spare rank.
– Memory mirroring mode
n Comply with the general installation guidelines.
n Install memory modules for channels 1 and 2 or channels 3 and 4. The
memory modules installed must be identical in size and organization.
n For a multi-processor configuration, each processor must have a valid memory
mirroring configuration.
– Memory scrubbing mode
n Comply with the general installation guidelines.
2.3.5 Memory Installation Positions
A CH121 V5 supports a maximum of 24 DDR4 memory modules. Balanced memory
configuration is recommended for optimal memory performance.
FusionServer Pro CH121 V5 Compute Node
User Guide
2 Hardware Description
Issue 06 (2019-08-10) Copyright © Huawei Technologies Co., Ltd. 15
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