High Quality Content by WIKIPEDIA articles! A clustered file system is a file system which is simultaneously mounted on multiple servers. There are several approaches to clustering, most of which do not employ a clustered file system. While many computer clusters don't use clustered file systems, unless servers are underpinned by a clustered file system the complexity of the underlying storage environment increases as servers are added. A shared disk file system uses a storage area network (SAN) or RAID array to provide direct disk access from multiple computers at the block level. Translation from file-level operations that applications use to block-level operations used by the SAN must take place on the client node. The most common type of clustered file system, a shared disk file system adds a mechanism for concurrency control which conventional filesystems intended for local storage do not have. Clients are afforded a consistent and serializable view of the file system, avoiding corruption and unintended data loss even when multiple clients try to access the same files at the same time.

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