NetBackup 4.5 Troubleshooting Guide for Windows - Symantec

Backup and Restore Functional Description
NetBackup Database Backups
The administrator can use an option in the administrator interface to start a manual
backup of the NetBackup databases or configure NetBackup to automatically back up its
databases (Figure 9).
It is possible to configure automatic database backups to occur either:
◆ After each scheduled backup session that results in the creation of at least one backup
image.
Or
NetBackup 4.5 Troubleshooting Guide for Windows
◆ After scheduled, user-directed, or manual backup or archive sessions that result in the
creation of at least one backup or archive image.
For automatic database backups, NetBackup uses the scheduler, bpsched, to determine if
any backups are required. The scheduler is activated by the request daemon, bprd, at
intervals determined by the Wakeup Interval global attribute. If a backup is needed,
bpsched uses the client daemon, bpcd, to start the database backup program,
bpbackupdb.
For a manual database backup, NetBackup invokes bpbackupdb directly, without going
through bprd or the scheduler.
Once started, bpbackupdb:
1. Queries bpdbm for the database paths to back up and the media ID to use for the
backup.
2. Starts the tape and optical manager, bptm, and sends it the media ID in a special
mount request.
The tape and optical manager, bptm, recognizes the request as being for a database
backup and checks the database to ensure that the media ID is not one used for
regular backups. The bptm program then includes the media ID in a request to the
Media Manager device daemon, ltid. The device daemon finds the media and
causes it to be mounted on an appropriate device.
430 NetBackup Troubleshooting Guide - Windows NT/2000
NetBackup 4.5 Troubleshooting Guide for Windows