Dell EMC NVDIMM-N Persistent Memory User 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
  5. 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.