6. NetWorker Control data - Resource database, Media database, Client File Index and Jobs database
NetWorker Commands App:
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The NetWorker server maintains tracking information for save sets in both the client file indexes (CFIs) and in the media database. Volume information is maintained only in the media database.
A client file index (CFI) stores information about each file backed up by a NetWorker client. There is one CFI per physical NetWorker client. The stored information includes file characteristics such as owner, size, permissions, and modification and access times, as well as the timestamp of when the file was backed up. All files in a given save set have the exact same backup timestamp. This information is used to support browsable recoveries, which allow you to easily recover a client to a specific point in time.
As a save set ages, its CFI records are automatically purged to save space. The length of time that the records are retained is determined by the Browse policy attribute in the client resource. CFIs may require large amounts of space on the NetWorker server. Each record in a CFI uses approximately 160 bytes. The default path of a CFI is /nsr/index/hostname_of_client/db6.
The media database contains information about all NetWorker volumes and the save sets on those volumes. For each volume there is a volume record. For each save set on a volume, there is a save set record. This information is critical for supporting recoveries and is also used during incremental backups to determine the timestamp of a previous backup. The location of the media database is /nsr/mm/mmvolrel.