The Effect of Underlying Filesystem Type

Some programs are predominantly I/O intensive or may open and close many temporary files. SunOS has a wide range of filesystem types, and the directory used by the program could be placed onto one of the following types.

Unix File System (UFS)

The standard file system on disk drives is the Unix File System, which in SunOS 4.1 and on is the Berkeley Fat Fast File system. Files that are read stay in RAM until a RAM shortage reuses the pages for something else. Files that are written are sent out to disk as described in “Disk Writes and the UFS Write Throttle” on page 172, but the file stays in RAM until the pages are reused for something else. There is no special buffer cache allocation, unlike other Berkeley-derived ...

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