6.1. File management
Chapter 2 introduced the major subsystems within operating systems. Every machine within a system has some main memory and at least one device, even if this is only a network connection, so some form of memory management and device management is always needed. Not every computer needs file management; a dedicated network gateway or a node of a process control system are examples of those that do not. Even a workstation might not have a local disk. In this case applications need assistance in retrieving files from remote file servers across a network.
The relative and projected performance of processors and disks, described in Section 3.2.1, should be borne in mind throughout this section. I/O will become a bottleneck in future ...
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