Another thing to consider, too, is do you have any sort of identifier or key in the DB2 source that could allow you to effectively break your source data into multiple sets/processes in your SSIS export package? If so, you could design your SSIS package(s) so that you can have multiple data flow tasks running concurrently, each with its own specific range of data to extract from the source, likely reducing the overall export time to your stage table.