Why is /boot/efi filesystem on software raid md device not mounted during boot on RHEL 7.3 and 7.4?

Solution In Progress - Updated -

Issue

  • /boot/efi filesystem resides on a software raid md device:
# df | grep efi
/dev/md1                 204516    9668    194848   5% /boot/efi

# lsblk | grep -B1 efi
├─vda3           252:3    0  200M  0 part  
│ └─md1            9:1    0  200M  0 raid1 /boot/efi
--
├─vdb3           252:19   0  200M  0 part  
│ └─md1            9:1    0  200M  0 raid1 /boot/efi
  • My system fails to mount /boot/efi filesystem during boot. The system boots successfully but /boot/efi isn't mounted after booting.

Environment

  • Red Hat Enterprise Linux 7.
  • /boot/efi filesystem on software raid md device.
  • mdadm version 3.4-14.el7 to 4.0-5.el7.

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