HP B6960-90078 manual

	Backup
	Pre- and Post-Exec Commands
Key Points	Check the following before configuring pre- and post- exec commands
	for a backup specification on a local or remote host:
	✓ If a pre-execcommand fails (returns a non-zero value), the backup
	status of the session is set to failed and the session is aborted.
	✓ If a post-execcommand fails (returns a non-zero value), the backup
	of the session is set to completed with errors.
	✓ The pre- and post-execcommands for a backup specification are by
	default NOT executed during a preview of a backup. This behavior is
	defined by the ExecScriptOnPreview variable in the global options
	file. See “Global Options File” on page 523 for details.
	✓ While the pre- or post-execcommands are running, the backup
	session cannot be aborted.
	✓ The pre- and post-execprocesses operate in the background mode.
	Therefore, do not use any interactive commands for pre- and post-
	exec processing.
	✓ The pre- and post-execscripts have to send some output at least
	every 15 minutes by default, or the sessions waiting for the scripts
	are aborted. You can change this time interval by modifying the
	ScriptOutputTimeout variable in the global options file.
	✓ Time-out is provided. If no message is received within the specified
	time-out in seconds, the session is aborted.
	✓ If there is no executable script on the host or if the path of the script
	is wrong, Data Protector displays an error message that the script
	failed and the session is aborted.
	✓ If a command writes any text to stdout, this text is sent to the
	Session Manager and written to the database. A stderr is redirected
	to /dev/null. You can redirect it to stdout to get error messages
	logged to the database.
NOTE	A pre- or post-execscript may hang because it did not close all file
	descriptors before forking a new process. If the new process runs in the
	background and does not exit, such as, for example, the database server
	process (dbstart), the scripts hang. You can use the detach command.
	The source of the detach command is provided in the detach.c file, but
	is officially unsupported. For example:

Chapter 5 259