md-raid device is missing after reboot.

Solution Unverified - Updated -

Issue

  • md-raid devices are not persistent across system reboots.
  • RAID volumes disappeared after the system reboot.
# cat /proc/mdstat
Personalities :
unused devices: <none>

# mdadm --examine --scan
# mdadm --assemble --scan

Environment

  • Red Hat Enterprise Linux 8, 9
    • md-raid

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