HI have Couple of computer below.
And I would like to know if can use these to practice two node 10GR2 RAC on linux at home.
If I can, what else needed for shared storage and etc.

HP Pavilion a6350z AMD Athlon 64 X2 4200+ 2.2GHz 2GB Ram 250GB HP Pavilion s3300z AMD Athlon 64 BE2400 2.3GHz 2GB 250GB DVD-RW

I appreciate any help on this.

Thanks

Assuming that Oracle and OS's licenses are not a problem for you , sure you can!

Once you've chosen a supported OS (eg. RHEL4) you can follow Oracle documentation for deploying your RAC environment. If you want to play, you can also use an OS that is not supported, although you may encounter problems for example during linking of Oracle binaries (you may fall into big headaches!).

My personal installation runs very well on my laptop:
However it's not a RAC. I've never installed a RAC on OSs different than RHEL and Solaris.

Given your system, I would recommend installing x86_64 version for both OS and RDBMS, only don't try 32 bit Oracle on a 64 bit OS.

The only option you have for shared storage is using ASM or OCFS (very buggy). Since it's a test system, you may also try with a shared mount via NFS, but if I remember correctly it's not supported (don't know if it works the same!).

Oh, you also need two physical NICs on both servers for public addresses and private interconnect. These are required for proper installation of clusterware software.

One last word: maybe it is better to try such a complex environment on virtual machines rather than on a real hardware! For testing purposes you may be able to startup two VMs with 512MB of RAM each and be able to install correctly a Linux system and a small Oracle instance.

Good luck!