In the case of a distributed setup, along with the DSS Hub installation, there may be one or more DSS Agent installations on the source and target machines. Since DSS versions 6.1.0 and higher are fully compatible with each other, upgrading all installations may not be required.

Each DSS release contains new features and/or fixes for certain bugs. Each feature or fix is only effective if the correct machine is upgraded. Typically, the release notes (available in DSS_HOME/dss.rel) contain information about which features and fixes have been added, and which machines must be upgraded for each feature and fix to be effective. New features should not be used until all machines that are specified for that feature are upgraded, otherwise, errors may occur.

For example, if a new release fixes an integrate bug, then that release must be installed on the DSS Agent machine(s) which perform integrate. If only the DSS Hub is upgraded using that release, there will be no benefit.