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Terminology

4 NetBackup ServerFree Agent System Administrator’s Guide

Frozen image

A stable disk copy of the data prior to backup. A frozen image is created very rapidly,

causing minimal impact on other applications. There are two basic types: copy-on-write

snapshot and mirror.

Frozen image method

A set of routines for creating a frozen image.

Frozen image source

This designates the entity (file system, raw partition, or logical volume) to which a frozen

image method is applied. Note that the frozen image source does not identify the files to

be backed up (see file list).

Mapping

The process of converting a file (in the file system or Volume Manager) to absolute

physical addresses for use by backup agents on the network. NetBackup ServerFree Agent

uses the VfMS library to perform file mapping.

Mapping methods

A set of routines for converting logical addresses to absolute physical addresses.

NetBackup ServerFree Agent includes support for file-mapping and volume-mapping

methods.

Mirror

A type of frozen image (see also snapshot). All writes to the disk or volume (primary data)

are also made to a physically separate disk or volume called a mirror. The mirror

maintains a complete duplicate of the primary disk or volume. At an appropriate

moment, all further writes to the primary disk or volume are held back from the mirror,

the mirror thus becoming a stable or frozen image of the primary. The frozen image can

then be backed up.

NetBackup Media Server (offhost backup method)

One of two offhost backup methods provided by NetBackup ServerFree Agent, in which

data movement is performed by a NetBackup media server.

Offhost backup

The off-loading of backup processing to a separate backup agent executing on another

host. NetBackup ServerFree Agent contains two offhost backup options: NetBackup

Media Server and Third-Party Copy Device.

Raw partition

A single section of a physical disk device occupying a range of disk sectors, without a file

system or other hierarchical organization scheme (thus, a “raw” stream of disk sectors).

NetBackup 4.0V ServerFree Agent System Administrator's Guide for Solaris

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