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.
ndctl disable-region all
ndctl disable-dimm all
ndctl zero-labels all
ndctl enable-dimm all
ndctl enable-region all
Recreate namespaces in the mode previously used (i.e.
ndctl create-namespace --mode=devdax --align=4k)
Repeat the
create-namespace command above for every NVDIMM-N installed.
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