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The Dynamic Storage Tiering (DST) option is built on the multi-volume support technology introduced in this release. Using DST, you can map more than one volume to a single file system. You can then configure policies that automatically relocate files from one volume to another, or relocate files by running file relocation commands. Having multiple volumes lets you determine where files are located, which can improve performance for applications that access specific types of files. DST functionality is a separately licensable feature that is available with the VRTSfppm package.
See Quality of Storage Service.