HP B6960-90078 manual Consistent and Relevant Backup, Perform recovery procedures, 444

Disaster Recovery

Preparing for a Disaster Recovery

On UNIX systems:

•Creation of tools, such as the auxiliary disk with the minimum operating system, network resources, and the Data Protector Disk Agent installed.

•Creation of pre-execution scripts, which collect the storage structure and other client-specific preparations.

On Windows systems:

•Updating System Recovery Data (SRD) and storing it to a safe place. You should restrict access to SRD files due to security reasons.

On all systems:

• Performing regular and consistent backups.

3.Perform recovery procedures

Follow the procedures and checklists you have tested to recover the crashed system.

	Consistent and Relevant Backup
	In the case of a disaster, the target system should be put back into the
	state it was at the time of the last valid known backup. Additionally, the
	system should function as it had functioned just before the last valid
	backup performance.
NOTE	On UNIX systems, some daemons or processes are active as soon as the
	system finishes booting, for various reasons (HP-UX example: License
	server at run level-2). Such an early process may even read the data into
	memory and write a “dirty flag” into some file while it runs. A backup
	taken at the standard operating stage (the standard run level-4) cannot
	be expected to yield a problem-free restart of such an application. To
	follow the example, the license server, if started after such a pseudo
	recovery, will realize that the data read from the file is inconsistent and
	will refuse to run the service as expected.

444 Chapter 10