btrfs subvolume snapshot -r /root /root/snapshot-root
umount /root
echo "dracut-root-block-created" | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
echo "ID_FS_UUID=$ID_FS_UUID"
} | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
udevadm info --query=property --name="$i" | grep -F 'ID_FS_UUID='
done
} | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
echo "dracut-root-block-created"
echo "ID_FS_UUID=$ID_FS_UUID"
} | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
mdadm -W /dev/md0 || :
mdadm --stop /dev/md0
echo "dracut-root-block-created" | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
mdadm -W /dev/md0 || :
mdadm --stop /dev/md0
echo "dracut-root-block-created" | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f
echo "dracut-root-block-created"
echo "ID_FS_UUID=$ID_FS_UUID"
} | dd oflag=direct of=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker status=none
-sync /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_marker
+sync
poweroff -f