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README.raid-1-for-efi-partion

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+# --------------------
+# RAID 1 of /boot/efi partition on Debian
+# --------------------
+
+# see: https://unix.stackexchange.com/questions/644108/raid-1-of-boot-efi-partition-on-debian
+
+The steps are mainly:
+
+1.) Install Debian without setting up the RAID for the ESP partition.
+
+         During the partitioning, I've already created two identical partitions 
+         marked as ESP partitions. They were on /dev/sda1 and /dev/sdb1
+
+2.) umount /boot/efi
+
+
+3.) Copie the contents of /boot/efi somewhere else (/boot/eficopy).
+
+
+4.) Create an array for use as EFI partion.
+
+      NOTE:
+      use metadata version 1.0
+
+      Version 1.0 still has the requirement (for this usecase) of placing the 
+      superblock at the end of the device, but also includes "the modern features of mdadm", 
+      by using common layout format as 1.1 & 1.2.
+
+      # mdadm --create --verbose /dev/md3 --level=1 --raid-devices=2 --metadata=1.0 /dev/sda1 /dev/sdb1
+
+
+5.) mkfs.vfat /dev/md3
+
+
+6.) found the UUID of the partition in /dev/disk/by-uuid:
+
+      # ls -al /dev/disk/by-uuid/
+
+
+7.) Changed the /boot/efi entry in /etc/fstab with the new UUID
+
+      for example:
+ 
+      UUID=C354-2922  /boot/efi       vfat    umask=0077      0       1
+
+
+8.) mount /boot/efi
+
+
+9.) Copy the data from the backup into /boot/efi again
+
+
+10.) Update initramfs:
+
+      # update-initramfs -u -k all