manually create Linux software raid system

1: stop md 

mdadm --stop /dev/md124

2: zap disk

sgdisk -Z /dev/sda

3: creat partition

sgdisk -n 1::1024MiB /dev/sda

sgdisk -n 2:: /dev/sda

4: update partition information

partprobe /dev/sda

5: zero-superbolock

mdadm --zero-superblock /dev/sda1

6: create sw raid -> use metadata 1.2 for data, 0.9 for boot

echo yes| mdadm --create /dev/md127 --force --level=1 --raid-devices=2 --name=root--uuid=1f975454:e7eb215d:e5a8a80e:43d5a964 --metadata=1.2 /dev/sda2 /dev/sdb2

echo yes| mdadm --create /dev/md/boot --force --level=1 --raid-devices=2 --uuid=2fd35b47:0866ab39:7a1ebdb9:dcc7dd0f --metadata=0.90 --name=boot-efi /dev/sda1 /dev/sdb1

7: wait resync to be ready

while [ 1 ];do

  sts_resync=$(cat /proc/mdstat|grep resync|wc -l)

  if [ $sts_resync -ne 0 ];then

    echo "syncing"

  else

    echo "rsync ready"

    break

  fi

  sleep 5

done