## <a name="2 Using AFS"></a> 2 Using AFS
The Usage Section of the [[AFSFrequentlyAskedQuestions]].
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- [[PreambleFAQ]]
- [[GeneralFAQ]]
### <a name="2.19 What are the ~/._afsXXXX f"></a> 2.19 What are the ~/.\_\_afsXXXX files?
They are temporary reference files used by the AFS Cache Manager.
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In UNIX filesystems, when you a remove a file that is kept open by a process, the file stays around physically while it is no longer referenced in any directory (which you will see as a mismatch between disk space usage according to df and du).
Some applications rely on that feature, e.g. they create a temporary file and remove it immediatley while keeping the file descriptor open. The file then disappears from the filesystem automagically when the process terminates or the file descriptor gets closed otherwise. Such applications could get into trouble with older versions of AFS, where the file could really disappear while it was held open.
git://git.openafs.org / openafs-wiki.git / blobdiff