The new dmstat(8) command. See “Commands for Other Utilities” in Chapter 1.

Site-defined policies and file tagging, including the new dmtag(1) command, let you customize the behavior of DMF. See “Customizing DMF” in Chapter 1 and Appendix C, “Site-Defined Policy Subroutines and the sitelib.so Library”.

Selective migration lets you choose particular MSPs or volume groups to use when migrating a file. See “File Weighting and MSP or Volume Group Selection Parameters” in Chapter 2.

More information about third-party backup packages. See “Using DMF-aware Third-Party Backup Packages” in Chapter 7 and Appendix F, “Third-Party Backup Package Configuration”.

Information about the dmdskvfy command, which verifies disk MSP file copies against the dmfdaemon database. See “dmdskvfy Command” in Chapter 6.

DMF 3.1 introduced a new version of the DMF user library. This new version is not compatible with the previous library nor with applications that were written and linked with the previous library. To allow the use of older applications after installing DMF 3.1 and to facilitate upgrading older applications, DMF 3.1 provides both the old version and the new version and introduces a linking mechanism. If you have an application that makes use of the DMF user library, libdmfusr.so, you should read “libdmfusr.so Library Versioning” in Appendix B. It will help you to decide if you should recompile your application with the latest library. It also explains how to allow your application to continue to function if you decide not to recompile. Changes to the library are detailed in Appendix B, “DMF User Library libdmfusr.so”.