Did you test whether submitting the form calls the addserver method in your controller?
Usually, in the form declaration you need to include controller AND method, like this:
PHP Code:
<form role="form" action="servers/addserver" method="POST">
Assuming that your controller is named "Servers.php".
Put the following code at the top of the addserver method:
PHP Code:
echo '<pre>';
print_r($this->input->post());
echo '</pre>';
die();
As soon as you submit the form, the method should output all POST data on your screen.