VERITAS File System 4.1 Administrator's Guide

Chapter 8 131
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.