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Dell EMC NVDIMM-N Persistent Memory User Guide

RHEL 7.6 features

Namespace creation

Starting from RHEL 7.6, ndctl utility is available natively.

NVDIMM-N modules that have FW 9324 are not visible in the OS as this firmware has label support. In other words, namespaces do not get enumerated automatically and using ndctl, namespaces have to be created first before mounting a file system and accessing them.

NOTE:It is also recommended that an OS patch is installed first to ensure proper functionality of the ndctl utility for creating namespaces. This patch can be downloaded here

Run through the commands below as a super user to create /dev/pmem devices.

To display DIMM list run:
  • $ ndctl list -D

Run command below to create namespaces. This command if used as is by default creates /dev/pmem devices. In order to create namespaces in other modes, refer to the link

This command should be run as many times as the number of NVDIMM-N modules plugged into the system.
  • $ ndctl create-namespace

For more information on how to use ndctl utility refer to the users guide here

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