Distributed data facility
The distributed data facility (DDF) allows client applications that run in an environment that supports DRDA to access data at DB2 servers. In addition, a DB2 application can access data at other DB2 servers and at remote relational database systems that support DRDA. DDF supports TCP/IP and Systems Network Architecture (SNA) network protocols. 
DDF allows the DB2 server to act as a gateway for remote clients and servers. A DB2 server can forward requests on behalf of remote clients to other remote servers regardless of whether the requested data is on the DB2 server.
With DDF, you can have up to 150,000 distributed
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