Shalom,
You have done nothing wrong.
When you set up raid 1, only a single drive is presented to the operating system.
You did good.
Do the installation, have fun.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com