To prevent Data Protector processes from exceeding system capabilities, the maximum number of concurrent backup sessions is limited. The limit is configurable.
Figure 64 on page 223 shows multiple sessions running concurrently.
Figure 64 Backup session information flow - multiple sessions
Pre-exec and post-exec commands
Data Protector pre-exec commands enable you to execute some actions before a backup or a restore session. Data Protector post-exec commands enable you to execute some actions after a backup or a restore session. A typical pre-exec action would be to shut down a database to put data in a consistent state.
The pre-exec and post-exec commands can be set for a backup specification and, as such, executed on the Cell Manager system, or they can be specified as a backup object option and thus executed on the client system where the respective Disk Agent is running.
Pre-exec and post-exec script commands can be written as executables or shell scripts. These are not supplied by Data Protector and must be written separately by, for example, the backup operator.