Dimm Installation Rules - Huawei FusionServer G5500 User Manual

FusionServer G5500 Server
User Guide
Online spare memory protection dedicates one rank of each memory channel for use as spare
memory. The remaining ranks are available for OS and application use. If correctable memory
errors occur at a rate higher than a specific threshold on any of the non-spare ranks, the server
automatically copies the memory contents of the degraded rank to the online spare rank.
Mirrored Memory Configuration
Mirroring provides protection against uncorrected memory errors that would otherwise result
in server downtime. Mirroring is performed at the channel level to one memory channel pair
that can be either:
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If an uncorrectable error is detected in the active memory channel, data is retrieved from the
mirror channel. This channel becomes the new active channel, and the system disables the
channel with the failed DIMM.
Memory Patrol Configuration
The memory engine corrects correctable errors upon detection. If these errors are not
corrected promptly, uncorrectable errors may occur.

6.4.3.6 DIMM Installation Rules

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Issue 02 (2017-12-15)
Channel 1 data being mirrored in channel 2
Channel 3 data being mirrored in channel 4
General DIMM Installation Rules
– CPU sockets connected to the installed DIMMs cannot be empty.
– Do not mix LRDIMMs and RDIMMs in the same compute node.
– 2.7.2 DIMM Slots
– When installing DIMMs in a memory channel, install DIMMs of more ranks and
then DIMMs of fewer ranks (starting from the slot farthest from the CPU in the
channel). For example, install quad-rank DIMMs, then dual-rank DIMMs, and then
sing-rank DIMMs.
DIMM Installation Rules for Specific Modes
– Installation Rules for the Memory Sparing Mode
Follow the general DIMM installation rules.
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The spare configuration of each channel must be valid.
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Different channels can have different spare configurations.
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Each channel with DIMMs installed must have a spare rank.
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– Installation Rules for the Memory Mirroring Mode
Follow the general DIMM installation rules.
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Install DIMMs in either channels 1 and 2, or channels 3 and 4. The installed
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DIMMs must be of the same size and organization.
For a multi-CPU configuration, each CPU must have a valid memory
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mirroring configuration.
– Installation Rules for the Memory Patrol Mode
See the general DIMM installation rules.
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lists the DIMM installation sequence.
6 Optional Part Installation
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