You can use the NAS configuration file, nas.cfg, to browse the Network Appliance server’s file system and snapshots. The nas.cfg file contains mappings of nodes to volumes or logical devices and their associated subdirectories that you may want to back up.
The configuration file allows you to do partial volume backups using the Backup Manager. If your Network Appliance server supports NDMP Version 4, you can automatically browse subdirectories and files in a volume and you do not need to configure the nas.cfg file for partial volume backups.
When you back up data from a file system, the Network Appliance NAS server creates a snapshot of that data set so that the backup reflects a consistent view of the data at the time of executing the backup job. The data is then indirectly backed up from this snapshot.
When you configure the nas.cfg file, you can auto-browse below the snapshot folder in the Backup Manager’s source tree. To do this, enter the full path to the snapshot file under the Network Appliance server name in the configuration file.
The following is an example of configuring the Daily0 snapshot file:
/vol/vol0/.snapshot/Daily.0
The following rules apply when you enter information in the NAS configuration file for a Network Appliance NAS server:
When performing a recovery operation using the configuration file, you can make multiple selections per volume for a job. If the configuration file has multiple snapshot paths, you can select any multiple of snapshot paths, as you would for normal Network Appliance backups.
Example: Multiple-path Designations in a nas.cfg File
The following is an example of multiple-path designations in a nas.cfg file:
qa-server3 /vol/vol0/.snapshot/Daily.0 /vol/vol0/.snapshot/Monthly.1 /vol/vol0/.snapshot/Weekly.3 ;
Note: You must not restore snapshot backups to the original location, because they are read-only. You can, however, restore snapshot backups to an alternate location.
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