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HP 9000 Systems: HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide > Chapter 1 The VxFS File System
Online Backup |
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The HP OnLineJFS product provides a method of online backup of data using the snapshot feature. An image of a mounted file system instantly becomes an exact read-only copy of the file system at a certain point in time. The original file system is snapped while the copy is called the snapshot. When changes are made to the snapped file system, the old data is first copied to the snapshot. When the snapshot is read, data that has not changed is read from the snapped file system. Changed data is read directly from the snapshot. Backups require one of the following methods:
For detailed information about performing online backups, see Chapter 4 “Online Backup”. |
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