How to transfer database from SQL Server to DB2?
Migrating between platforms is not always an easy task. Besides the changes in schema and SQL code, the data itself may not be an exact fit between platforms. For example, a TIMESTAMP in SQL Server is not the same as a TIMESTAMP in Oracle.

Microsoft offers the SQL Server Migration Assistant, but that is for getting data into SQL Server, not for exporting to other platforms.

The only company I know that offers tools and knowledge for migrating from SQL Server to DB2 is Ispirer. I've never used their tools however, but you may want to start with them.

HTH