Coda is an Advanced NetworkFileSystem developed as a research project by the team which wrote AFS. Coda extends the FileSystem for DisconnectedOperation.

Some of AFS' developers noticed that caching lets it work quite well for a while in the face of loss of the connection except for issues when writes occur. Coda was to allow for scenarios like allowing a laptop with a WLAN connection wandering in and out of range to seamlessly synchronize all files (and notify the user of conflicts). The project was quite a success.

Coda is supported in Kernel 2.6.7 but no longer in active development. It seems to still be maintained, however, as it is not completely dead -- the last release as of July 2004 was v6.0.6 in April. Currently it seems to be the only option for a FileSystem with support for DisconnectedOperation until OpenAFS supports this as well.

A former developer of Coda started Intermezzo as a simpler implementation.