Seagate ST39175LW Guía para resolver problemas descargar pdf (Pagina 155)

Chapter 10, Troubleshooting 141

Process Diagrams for Offhost Backup

1. The NetBackup master 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 (parent) 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 bpdbm for the NetBackup file

database on the master server.

5. bpbkar requests creation of a frozen image of the client’s active data. 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). The file/volume mapping information (list

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

the frozen image of the client data (cached).

7. On the media server, bptm creates a child process, which reads the mapping

information (extent list) from bpbkar.

8. Based on the extent list received from bpbkar, bptm reads the client data (backup

image) 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 (to obtain

the original contents of the blocks that have changed since the backup was initiated).

9. The bptm child stores the client data block-by-block in shared memory.

10. The parent bptm process then takes the backup image from shared memory and

sends it to the storage device. For information on how the tape request is issued, refer

to Appendix A of the NetBackup Troubleshooting Guide.

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Seagate ST39175LW Guía para resolver problemas Pagina 155