Primarily users of black box-like systems, like SAP™ or Peoplesoft™, are those who may profit most by DB2 subsystem cloning, because this is their only chance to obtain production-identical test systems within an acceptable time frame. And the following is true in general: a subsystem clone always is the least costly method to create test environments containing life data, playgrounds for impending release changes, read-only query systems, and much more.