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Chapter 1, Introduction 23

Offhost Backup Overview

1. The NetBackup server or client initiates the backup, causing the NetBackup request

daemon bprd to start the scheduler, bpsched. bpsched processes the class

configurations depending on the initiator of the backup (scheduled, immediate

manual, or user directed). Refer to Appendix A of the NetBackup Troubleshooting Guide

for more information on this stage of the backup operation.

2. bpsched uses bpcd (client daemon) to start the backup/restore manager (bpbrm) on

the media server.

3. bpbrm starts the Media Manager process bptm and also starts the actual backup by

using bpcd on the client to start the client’s backup and archive program bpbkar.

4. bpbkar sends information about files within the image to the backup/restore

manager bpbrm, which directs the file information to the NetBackup file database on

the master server.

5. bpbkar requests creation of a frozen image of the client’s active data, by means of the

frozen image library. bpbkar uses the frozen image method that was configured for

the frozen image source.

6. bpbkar requests file/volume mapping information about the client data. bpbkar

uses one or more mapping libraries to decompose the client’s data into physical disk

addresses (also referred to as disk extents). This file/volume mapping information (list

of extents) comes from one of two sources: the client’s active (primary) data, or from

the frozen image of the client data (cached).

7. bptm reads the mapping information (extent list) from bpbkar.

8. bptm sends the third-party copy command with the extent list to the third-party copy

device. For information on how the tape request is issued, refer to Appendix A of the

NetBackup Troubleshooting Guide.

9. The third-party copy device reads the backup image (client data) from two places:

from the client’s active data (for those blocks that have not changed since the backup

was initiated), and from the frozen image cache (for the original contents of the blocks

that have changed since the backup was initiated).

10. The third-party copy device sends the backup image to the storage device.

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

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Seagate ST39175LW Guía de usuario Pagina 33