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Offhost Backup Overview

22 NetBackup ServerFree Agent System Administrator’s Guide

Offhost Backup Overview

The primary goal of NetBackup ServerFree Agent is to move I/O processing off the

NetBackup client (application host) to either of the following:

◆ A backup agent executing on another server

◆ A fibre-channel attached third-party copy device

Note that the disk(s) containing the client’s data must be “shared,” that is, visible to both

the NetBackup client and the NetBackup media server. The disk(s) can be connected

locally, or through a SAN.

The backup agent reads data from the frozen image and writes the data to a storage

device. Since backup agents are unaware of logical organizations of data such as file

systems and volume managers, they can access the data only from its physical disk

address location. In order for NetBackup to perform an offhost backup, it must first

translate the logical representation of the data to its physical disk addresses. This

logical-to-physical translation process is referred to as mapping the data. During an offhost

backup, the mapping information is transmitted to the backup agent.

File/Volume Mapping Methods

The mapping methods used by NetBackup ServerFree Agent are installed as part of the

NetBackup ServerFree Agent product. When a backup is initiated, the correct mapping

method is automatically selected by NetBackup, depending on whether the backup data

is configured over physical devices, logical volumes, or file systems.

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Seagate ST39175LW Anleitung zur Fehlerbehebung Seite 36