Abstract
This chapter discusses one of the truly outstanding features of Tru64 UNIX clustering: the Cluster File System. The term “single-system image (SSI)” is common. The CFS provides a common, transparent view of all file systems to all cluster members. This ability, along with the Cluster Alias subsystem, makes up the core of Tru64 UNIX clustering. If mounting a file system on a cluster is necessary, it is required to log in to any member in the cluster, issue a normal mount (8) command, and all members in the cluster view the same file system at the same mount point. A question may arise on: what happens to an NFS file system if the NFS server crashes. The CFS does not suffer from this problem because another cluster member will transparently take over the job of serving the file system to the other cluster members. The CFS does all this and still manages to adhere to the X-Open and POSIX standards. The net result is that in a TruCluster Server environment, it is possible to log in to any member of the cluster and have virtually an identical view of the files on the cluster mounted file systems. CFS, a client-server implementation, is conveniently sandwiched between the Virtual File System (VFS) and the physical file systems and acts as a router directing I/O from the VFS to all parts physical.
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