Distribute Database using MultiDB plugin

Hi,

I am going to create a blog site.it need large amount of database.
I have 2 servers with me.
For a test i created 16 database with the tool provided by MultiDB Plugin.
I created 8 database in one server

CREATE DATABASE multidbtest_0 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_1 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_2 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_3 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_4 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_5 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_6 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_7 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

and remaining 8 database in another server

CREATE DATABASE multidbtest_8 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_9 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_a DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_b DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_c DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_d DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_e DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE multidbtest_f DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

what modification is need in db-config.php to make the functioning of multidb smoother?

How can i specfiy the ip address of servers in db-config.php file?