HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide

82 Chapter4
Online Backup
Introduction
Introduction
This chapter describes the online backup facility provided with the VxFS
file system. The snapshot feature of VxFS can be used to create a
snapshot image of a mounted file system, which becomes a duplicate
read-only copy of the mounted file system.
NOTE Snapshot file systems are available only with the optional HP
OnLineJFS product.
The following topics are covered in this chapter:
• “Snapshot File Systems”
— “Snapshot File System Disk Structure”
— “How a Snapshot File System Works”
• “Using a Snapshot File System for Backup”
— “Creating a Snapshot File System”
— “Making a Backup”
• “Performance of Snapshot File Systems”