Redistribution DAG Databases

Hi

I have exchange 2010 with 2 server as Mailbox server

we have DAG contain 20 Databases

when i run the Redistribution DAG Databases script i see the databases balanced according preference server

how can i distirbute the database based on my vision

i didnt want exchange to distribute or balanced the databases to automatically , i want inform exchange put DB1,DB2,DB3 on MBX1

and put DB5,DB6,DB7 in MBX2

i didn't want this distribution going arbitrary 

Thanks

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