I can't have too index.php ??

I creat a index.php to display the posts by date. It works.
Then i creat index-2.php display the posts by random, i upload this file to FTP it’s said “Error 404 – Page Not Found”.
BUT when i change the file name of index-2.php to index.php it works.(of course i have delete the old index.php first)

Can somebody tell me how to solve this problem. I want browser can read all the posts by date but i also want they can choose read all the posts by random.

Thank you so much.