A fundamental factor in computer performance is file access time. In a networked environment using NFS, every file access request across the network affects performance. The Cache File System (CacheFS) can be used to improve performance of NFS-mounted file systems or slow devices such as a CD-ROM. When a file system is cached, the data read from the remote file system or CD-ROM is stored in a cache on the local system’s disk. First, let’s introduce some terms:

  • Back file system The file system on the remote host, or CD-ROM, that is being cached. Typically, this is an NFS or HSFS file system. Files in the back file system are called back files.

  • Front file system The file system that contains the cached data, typically a UFS file system. ...

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