How CODA works?

Please, Describe working of CODA?
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To understand how Coda can operate when the network connections to the server have been severed, let's analyze a simple file system operation. Suppose we type: ``cat /coda/tmp/foo'' to display the contents of a Coda file. What actually happens? The cat program will make a few system calls in relation to the file. A system call is an operation through which a program asks the kernel for service: for example, when opening the file the kernel will want to do a lookup operation to find the inode of the file and return a file handle associated with the file to the program. The inode contains the information to access the data in the file and is used by the kernel, the file handle is for the opening program. The open call enters the virtual file system (VFS) in the kernel, and when it is realized that the request is for a file in the /coda file system it is handed to the Coda file system module in the kernel. Coda is a pretty minimalistic file system module: it keeps a cache of recently answered requests from the VFS, but otherwise passes the request on to the Coda cache manager, called Venus. Venus will check the client disk cache for tmp/foo, and in case of a cache miss, it contact the servers to ask for tmp/foo. When the file has been located, Venus responds to the kernel, which in turn returns the calling program from the system call. Source:
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