Adding partition does not work (1 reply)

I am doing this:
http://dev.mysql.com/doc/refman/5.5/en/innodb-raw-devices.html

in order to using a second partition. I uncomment and edit these lines:
innodb_data_home_dir =
innodb_data_file_path = /var/lib/mysql/ibdata1:27004M;/var2/ibdata2:50M:autoextend


When I restart MySql service, the file ibdata2 is created but not used.

I mean, Mysql keeps using the file ibdata1 until the partition /var is full up.

What can I do?