Veritas File System 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 8 115
8 File Change Log
CAUTION File Change Log is currently not officially supported, and VERITAS strongly cautions
against using it in a production environment. Although FCL is not 100% complete, it is
functional and can be used to begin developing new applications. File Change Log will be
fully operational in the next VERITAS File System maintenance release.
The VxFS File Change Log (FCL) tracks changes to files and directories in a file system. Applications that
can make use of FCL are those that are typically required to scan an entire file system to discover changes
since the last scan, such as backup utilities, webcrawlers, search engines, and replication programs.
The File Change Log records file system changes such as creates, links, unlinks, renaming, data appended,
data overwritten, data truncated, extended attribute modifications, holes punched, and miscellaneous file
property updates.
NOTE FCL records only changed not the actual data. It is the responsibility of the application to
examine the files that have changed data to determine which data has changed.
FCL functionality is a separately licensable feature. See the VERITAS File System Release Notes for more
information.