Typical CA Disk processing operates at the data set level; that is, each data set is processed as an individual logical unit, with the data being read and written in logical order. However, in order to provide the capability to perform Stand-Alone Restore, CA Disk has developed the ability to process at the volume level for backup and recover processing; that is, a DASD volume is read and written starting at cylinder 0 track 0, and continuing through the end of the used cylinders.
VBACKUP Function is the CA Disk volume-level backup function invoked through DSCL. The volume-level backup function will create one backup tape (or a set of backup tapes) for each volume. Each tape or set of tapes will contain all of the data, starting at cylinder 0, track 0, and continuing through all used cylinders. CA Disk supports software-based hot backup and an additional hot backup technique provides capabilities of through integration with IBM's Snapshot and Flashcopy features. Hot backup allows file backups to occur while the applications using these files are still running. This additional capability facilitates application-level backups with virtually zero downtime. This functionality enables CA Disk to select and process full backups while the input volume is in OFFLINE status. This feature supports image volumes generated by Hot Backup technologies like EMC Timefinder, IBM Flashcopy, HDS Shadowcopy, and others.
VRECOVER Function is the CA Disk volume-level recovery function. It will overlay the entire volume in extent track order, or a specified range of absolute tracks on the volume. If the data on the volume-level backup is compressed, it will be decompressed during VRECOVER processing using the CA Disk-supplied techniques.
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