Step 8: Create the second RAID: MD1

Select to create the MD device:

Make it RAID1:

Set the number of active devices (I just use two).

Set the number of spare devices:

Select the according partition that shall be used:

Step 9: Create the third RAID: MD2

Select to create the MD device:

Make it RAID1:

Set the number of active devices (I just use two).

Set the number of spare devices:

Select the according partition that shall be used:

Step 10: Create the fourth RAID: MD3

Select to create the MD device:

Make it RAID1:

Set the number of active devices (I just use two).

Set the number of spare devices:

Select the according partition that shall be used:

Now we are done here and go back:

Step 11: Configuring the /boot raid

Now select the MD0 device

Select "Use as":

For the /boot partition I select Ext3

Select the mount point:

Set it to /boot:

And you're done with this partition: