New Features
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## New Features

| Note: This is the last release that will support the tape media-specific process (MSP). The tape MSP has been made obsolete by the library server (LS).

For information on changes in DMF functionality, including bugs fixed in recent releases, refer to the Dependencies and News buttons on the DMF installation interface (`dmmaint(8)`).

The major new feature of DMF 3.0 is the disk cache manager (DCM), which provides n-tier capability. This new feature lets you configure the disk media-specific process (MSP) to manage data on secondary storage disk, allowing you to further migrate the data to tape as needed. The DCM provides an automated method of using economical disks of modest performance (such as serial ATA disks) as a fast-access DMF cache for files whose activity levels remain high, while also providing migration to tape for those files requiring less frequent access. See:

- “How DMF Works” in Chapter 1

- “Disk Cache Manager (DCM) Commands” in Chapter 1

- Table 2-1

- “DCM Policies” in Chapter 2

- “Setting Up Disk MSPs in DCM Mode” in Chapter 2

- Table 2-4

- “Disk MSP and Disk Cache Manager (DCM)” in Chapter 6

- “Space Management and the Disk Cache Manager” in Chapter 3

This guide also incorporates information from the obsolete DMF Release and Installation Guide. For installation instructions, see the `/CDROM/platform/DMF.Install` file on the CD-ROM for each operating system.

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