Importance

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Abstract

A Storage Mapping Driver (SMD) that provides a system and method for determining the application host storage locations of file data so that the file data can be later backed up directly from its storage media. The application host location of the file data is sent to the backup host either just prior to a backup or as the information is obtained. In this way the backup host is capable of backing up the files without reference to systems on the application host such as the file system manager and the volume manager. The SMD invokes the file system manager and/or the volume manager to read a file to be backed up in order to obtain a file map. If the host system does not have a file system manager and/or a volume manager, a backup file system manager is provided, which is invoked by the SMD to read a file to obtain a file map for use during a backup. The file system manager, volume manager and/or backup file system manager communicates with a disk device driver, which in turn reads the application host storage data of the file. The application host storage data includes one or more disk media names and one or more application host disk addresses of the file to be backed up. Once the disk device driver reads the entire file, the application host storage data is stored and the backup host can backup the file from the storage media to a backup media using only the application host storage data to identify the file.

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