To setup RIAD 0 go to the Server Manager under File and Storage Services > Volumes > Storage Pools.
next page will list disks added to the server, we are going to use the same disk to setup a RAID set.
Go to Tasks > New Storage Pool.
Give the storage pool a name like MIRROR1 and go to the next step.
Select the disks you want to add to the storage pool and configure the allocation. So it will assign the disk as mirror disk.
Now you see that you created a Storage Space with your new created Storage Pool. Select the Storage Pool and on the Virtual Disks Tasks select New Virtual Disk.
Select the Storage Pool and click Next.
Give it a name and click on next.
Select the Layout option you want and click on Next.
Select the Provision Type and click on Next.
Select the Size and Next again.
Double check all the above setting and numbers and if all good then, click Create.
Next step is to create a volume so tick the option Create a volume when this wizard closes and click Close.
Select the new Virtual Disk and click Next.
Set the Volume Size and click on Next for the next step.
Give the new volume a drive letter or assign it to a folder and click on Next.
Set the File System Settings and click on Next.
Double check all the above setting and numbers and if all good then, click Create.