HP B6960-90078 manual How a Backup Session Works, How a Restore Session Works, Concepts Guide

Introducing Data Protector

The Data Protector Cell Environment

NOTE	For further information on these terms, or on the principles of Data
	Protector operation, see the HP OpenView Storage Data Protector
	Concepts Guide.

How a Backup Session Works

A backup session starts either when a backup is requested through the user interface, or when a scheduled backup is initiated. During this session, Data Protector backs up the requested filesystems and disks to the specified media.

1.The Cell Manager determines the type of session that has been requested (backup) and starts the appropriate Session Manager.

2.The Session Manager reads the backup specification and determines what needs to be backed up and which devices to use.

3.The Session Manager then starts a Media Agent for each media drive that will be used and a Disk Agent for each disk that will be read.

4.The Monitor window appears. This window lets you respond to mount requests and view the progress of a backup session.

5.The Disk Agents start sending data to the Media Agent.

6.If more than one Disk Agent is used, the Disk Agents send data to the Media Agent concurrently and the Media Agent places the data on the medium.

7.As each block of data is written to the medium, the Media Agent sends information to the Session Manager about what has been backed up. The Session Manager uses this information to update the catalog of backed-up files in the IDB.

How a Restore Session Works

A restore session starts when a restore is requested. During this session, Data Protector performs a restore of requested files and disks from the media.

1.You specify which filesystems to restore and how to restore them, using the Data Protector user interface.

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