Seagate ST39175LW Anleitung zur Fehlerbehebung PDF herunterladen (Seite 161)

Chapter 10, Troubleshooting 147

Process Diagrams for Offhost Backup

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

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

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 a

frozen image method. 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 services 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 the frozen image of the client data on the mirror (secondary)

disk.

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 the frozen

image on the mirror (secondary) disk.

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

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Seagate ST39175LW Anleitung zur Fehlerbehebung Seite 161