Dell PowerEdge R740 EMC NVDIMM-N Persistent Memory User Guide - Page 31

DIMM Configuration Changes

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8 DIMM Configuration Changes Dell EMC recommends that NVDIMM-N data contents be backed up to external storage before making any changes to the server memory configuration. This applies to both NVDIMM-Ns and RDIMMs. Due to memory Error Correction (ECC) algorithms that are unique to each memory slot and memory configuration, NVDIMM-Ns may generate errors after a memory configuration change. If the server DIMM configuration changes, it is recommended that the NVDIMM-N be erased and reset to factory defaults in BIOS Setup prior to utilization. In the scenario where the DIMMs (both RDIMMs and NVDIMM-Ns) must be moved or the system board must be replaced, all DIMMs must be repopulated in the exact same slot as in the original server. The only migration scenario that is supported is a slot for slot replacement between system boards. Dell EMC also recommends that BIOS NVDIMM settings are identical. DIMM Configuration Changes 31

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DIMM Configuration Changes
Dell EMC recommends that NVDIMM-N data contents be backed up to external storage before making any changes to the server
memory configuration. This applies to both NVDIMM-Ns and RDIMMs. Due to memory Error Correction (ECC) algorithms that are unique
to each memory slot and memory configuration, NVDIMM-Ns may generate errors after a memory configuration change. If the server
DIMM configuration changes, it is recommended that the NVDIMM-N be erased and reset to factory defaults in BIOS Setup prior to
utilization.
In the scenario where the DIMMs (both RDIMMs and NVDIMM-Ns) must be moved or the system board must be replaced, all DIMMs
must be repopulated in the exact same slot as in the original server. The only migration scenario that is supported is a slot for slot
replacement between system boards. Dell EMC also recommends that BIOS NVDIMM settings are identical.
8
DIMM Configuration Changes
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