Seagate ST39175LW Guía para resolver problemas descargar pdf (Pagina 19)

Chapter 1, Introduction 5

Terminology

File list

The list of files to be backed up for a NetBackup policy. For ServerFree Agent, the files in a

file list must be part of a file system or raw device that was designated as a frozen image

source.

File system

Has two different meanings.

◆ When referring to a product, such as the ufs (Sun Solaris) or VxFS (VERITAS) file

system, it refers to the management and allocation schemes on which the entire file

tree is structured.

◆ When referring to a particular component in a file tree, file system means a directory

(with any subdirectories and files) that is attached to the UNIX file tree by means of

the mount command. When a file system is selected as either a frozen image source or

as an entry in the NetBackup file list, this definition applies.

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 or raw device (in the file system or Volume Manager) to

absolute physical disk addresses or extents for use by backup agents on the network.

NetBackup ServerFree Agent uses the VxMS library to perform file mapping.

Mapping methods

A set of routines for converting logical file addresses to absolute physical disk addresses

or extents. NetBackup ServerFree Agent includes support for file-mapping and

volume-mapping methods.

Mirror

◆ A disk that maintains an exact copy or duplicate of another disk. A mirror disk is

often called a secondary, and the disk that it copies is called the primary. All writes to

the primary disk are also made to the mirror (or secondary) disk.

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Seagate ST39175LW Guía para resolver problemas Pagina 19