About device drivers and files for HP-UX persistent DSFs
NetBackup supports persistent device special files (DSFs) for robotic tape libraries and tape drives. Persistent DSFs are a component of a new storage stack addressing model HP calls agile addressing. The device World Wide Identifier (WWID) identifies a device; a device path does not identify a device. The device file name of the logical unit is independent of the paths that lead to the LUN.
When HP-UX 11i v3 is installed, both persistent DSFs and legacy device files are created on the system.
You can use persistent DSFs on some HP-UX servers and legacy device files on others. However, if you use legacy device files, you must configure devices manually in NetBackup.
Note:
NetBackup device discovery finds persistent DSFs only. Therefore, Veritas recommends that you use persistent DSFs.