hard drive – The Mac Pro installation disc continues to eject please, help us

I do not know Macintosh computers very well, so I can not understand why the installation disk continues to eject when I try to boot from the disk by holding down the "C" button or the option button.

This is not the optical drive because I was able to boot Linux with a live CD.

While in Linux, I formatted the hard drive on which I want to install the operating system as HFS + and I have not encountered any problems.

I think I can use the wrong installation disk because I can not confirm that this disk belongs to this machine.

The disc reads:
MAC PRO
MAC OS X INSTALLATION DVD
VERSION 10.6.2
DISC VERSION 1.0
2009 APPLE INC.

The computer identifies as:
A1186 MAC PRO 2.66QX / 2X512 / 7300GT

How can I determine if it is the correct disc and / or what is the last retail disc I can use on this machine?