I have the following settings but I am still not getting write to master

I have two web servers (xxx.xxx.xxx.4 and xxx.xxx.xxx.5) that are trying to read from a master slave configuration.

the db.php is in the wp-config folder.
I have added the following line to wp-config.php file:

define ( 'DB_CONFIG_FILE' , '/var/www/html/%folder_name%/%folder_name%/db-config.php' );

I have added the following to the db-config.php file:

$myVAR1 = "%Password%";
$escapedMyVAR1 = mysql_real_escape_string($myVAR1);
$myVAR2 = "xxx.xxx.xxx.6";
$escapedMyVAR2 = mysql_real_escape_string($myVAR2);
$myVAR3 = "xxx.xxx.xxx.7";
$escapedMyVAR3 = mysql_real_escape_string($myVAR3);

$wpdb->add_database(array(
	'host'     => $escapedMyVAR2,     // If port is other than 3306, use host:port.
	'user'     => %Username%,
	'password' => $escapedMyVAR1,
	'name'     => %Database%,
));

$wpdb->add_database(array(
	'host'     => $escapedMyVAR3,     // If port is other than 3306, use host:port.
	'user'     => %Username%,
	'password' => $escapedMyVAR1,
	'name'     => %Database%,
	'write'    => 0,
	'read'     => 1,
	'dataset'  => 'global',
	'timeout'  => 0.2,
));

Should I just remove all the defined(‘DB_NAME’, in wp-config.php?

It still has the master (xxx.xxx.xxx.6) config in there, will this cause the hyperdb to not enable?

http://wordpress.org/extend/plugins/hyperdb/