•In the case of input files, which are larger than the physical size of the tape device, the data spans across multiple tape devices. In addition, the block size (bs) must be specified accurately as an exact multiple of the physical device size. Failure to specify the exact block size can result in data inconsistency, or data overlap. For more information on this limitation, see dd(1).

•The dd tool does not provide an option to perform an incremental backup operation. As a result, only the recently updated or changed blocks of data are backed up.

Following are the limitations of using cpio to back up and restore data on HP-UX EVFS volumes:

•The cpio tool does not support the archiving of files with sizes larger than 2 GB, and files with user IDs or group IDs that are larger than 60 k. Files with user or group IDs greater than 60 K are archived and restored only under the user or group IDs of the current process.

HP OpenView Storage Data Protector

HP OpenView Storage Data Protector is a backup solution that provides reliable data protection and high accessibility for your fast-growing business data. It offers comprehensive backup and restore functionality specifically tailored for enterprise-wide and distributed environments. Data Protector is an effective back up and restore tool for environments that range from a single system to multiple (thousand) systems at different locations.

The Data Protector cell is the basic management unit in the data protector. It consists of a network environment with a Cell Manager system, one or more Installation Servers, client systems, and devices. The Cell Manager and Installation Server can be on the same system (default setting) or on different systems.

For more information on Data Protector and the features it supports, see the HP OpenView Storage Data Protector Concepts Guide, available at:

http://www.docs.hp.com

Backup and Restore

A backup is a process that creates a copy of data on the backup media. This copy is stored and kept for future use in case the original is destroyed or corrupted. In most cases, the source is data on a disk, such as files, directories, databases, and applications. If the backup is expected to be used for disaster recovery, it needs to be consistent. Software that actually copies data to the destination is a backup application. The destination is a backup device, such as a tape drive, with media to which a copy of the data is written.

A restore is a process that recreates the original data from a backup copy. This process consists of the preparation and actual restore of data, and some post-restore actions that make that data ready for use. The source is a backup copy. A restore application is software that actually writes data to a destination. The destination is usually a disk to which the original data is written.

Full Volume Backup of Encrypted Data to a Tape Device

This section describes how to perform a full volume backup of encrypted data from an HP-UX EVFS volume to a tape device.

Table 1 lists the source and the target for the full volume backup of encrypted data on HP-UX EVFS volumes.

2