AFS uses a pessimistic replication strategy with its files, only allowing one read/write server to receive updates and all other servers acting as read-only replicas. Then it transitions back to normal connected-mode operation.ДЄlso different from AFS is Coda's data replication method. Upon network reconnection, the client moves to reintegration state it sends logged updates to the servers. This operating state is called disconnected operation.

If the network connection is lost, the Coda client's local cache serves data from this cache and logs all updates. During normal operation, a user reads and writes to the file system normally, while the client fetches, or 'hoards', all of the data the user has listed as important in the event of network disconnection.

Well defined semantics of sharing, even in the presence of network failureД¬oda uses a local cache to provide access to server data when the network connection is lost.

Continued operation during partial network failures in server network.

Security model for authentication, encryption and access control.

High performance through client side persistent caching.

Disconnected operation for mobile computing.

ContentsД¬oda has many features that are desirable for network file systems, and several features not found elsewhere. The InterMezzo file system was inspired by Coda.

It descended directly from an older version of Andrew File System (AFS-2) and offers many similar features. Coda is a distributed file system developed as a research project at Carnegie Mellon University since 1987 under the direction of Mahadev Satyanarayanan.

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