How to mirror disk on Sol 2.7

I just got in a used Sun 420R with two 18GB disks and I have to set it up right away to simulate a product trial. I need to mirror the primary disk. Can 2.7 do that right out of the box or do I need to purchase extra software? I saw DiskSuite mentioned here, is that extra or does it come with the 2.7 media?

Also, can anyone point me to a "mirror setup guide" of some kind or is it straight forward? All help greatly appreciated!!

Regards,
David