EDIT: Some people have asked “Why run RAID 1 mirroring when you already have a solid backup strategy?” The answer is simple: Downtime is bad and costs money … some people a lot of money! Running a RAID 1 mirror on production environments is essential to maintaining high up-time. Hard Drives can and do fail so its better to be prepared for it. Restoring files from backups and locating a replacement disk is not fun at 5AM. If a RAID mirror disk dies you can plan a time to repair it, you won’t have that option if you only have backups.

Step 1: Start the Mini in Target Mode. Press the T during start. In a few seconds the firewire logo will appear on your screen.
Step 2: Go to your second Mac. Connect the firewire cable between second Mac and Mini.
Step 3: On the second Mac start the disc utility. The two identical drives on your mini will show. Create a new Raid set (mirrored = Raid 1). Include both drives. Confirm the warning that all data on the mini will be lost.
Step 4: Make sure your second Mac has CD/ DVD sharing option installed. This is to use the super drive to install OS X Server on the mini.
Step 5: Shutdown both Macs
Step 6: Start your second Mac in target mode. Make sure the firewire cable is still connected.
Step 7: Start the Mini with the option key pressed.
Step 8: Insert the OS X Server install disc in your second Mac.
Step 9: wait till the drive logo appears om the Mini. Continue the install. Will take about an hour.

An even easier option is to purchase or borrow a USB DVD drive and just boot from that.

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Source: HT2559