Users Guide

Table Of Contents

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 https://www.mankier.com/1/ndctl-create-namespace

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 https://docs.pmem.io/ndctl-users-guide

Linux Errata

Following errata effects RHEL 7.6:

● Patch to make ndctl utility work can be downloaded from here https://access.redhat.com/solutions/3920221

● Red Hat Enterprise Linux 7.6 or later might lose access to the data on NVDIMM-N memory module after updating

from NVDIMM-N firmware version 8860 to 9234 or later. To restore access to the data, in Red Hat Enterprise Linux 7.6

Command-Line Interface, login to root user and run the following commands:

NOTE: Ensure that the RHEL 7.6 create-namespace patch above is installed.

1. ndctl disable-region all

2. ndctl disable-dimm all

3. ndctl zero-labels all

4. ndctl enable-dimm all

ndctl enable-region all

6. Recreate namespaces in the mode previously used (i.e. ndctl create-namespace --mode=devdax --

align=4k)

7. Repeat the create-namespace command above for every NVDIMM-N installed.

Linux