Seagate ST39175LW Betriebsanweisung PDF herunterladen (Seite 12)

Overview

2 NetBackup ServerFree Agent System Administrator’s Guide

Overview

NetBackup 4.0V ServerFree Agent provides data protection services for frozen image

data, and supports offhost backup over Fibre Channel networks (in addition to

conventional backups to locally attached devices).

Frozen Image Services

A frozen image is a stable disk copy of the client’s data made prior to backup. Such a copy

is important on file systems and active Oracle databases, where updates to files or tables

can occur at any time. Making a stable, consistent copy (frozen image) is an important

prerequisite to making a correct backup.

NetBackup ServerFree Agent supports several ways of creating a frozen image. Refer to

“Frozen Image Overview” on page 10 for further description of frozen image technology.

Offhost Backups

The other major component of NetBackup 4.0V ServerFree Agent is support for offhost

backup. Offhost backup shifts the burden of backup processing onto a separate backup

agent (NetBackup media server or third-party copy device), greatly reducing the impact

on the client’s computing resources ordinarily caused by a local backup. A backup agent

executing on another host reads the data from the client disk and writes it to storage.

Figure 1. Separate backup agent for offhost backup

The backup agent can be either a NetBackup media server or a third-party copy device

that implements the SCSI Extended Copy command.

storage

Backup agent

(NetBackup media

server or third-party

copy device)

Disk containing

client data

NetBackup

master server

NetBackup

client

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

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Seagate ST39175LW Betriebsanweisung Seite 12