Assume that we want to create an operating system using a multi-server approach, similar to how it is done in MINIX 3 ( or GNU Hurd ( A multiserver operating system has a minimal kernel, called the microkernel, which runs in privileged mode. All the other services of the system are following a server architecture (driver server, process server, file server, and so forth). Each server belongs to a different memory address space and runs on top of the microkernel in user mode. The pros of this approach are that the operating system can become more fault-tolerant, reliable, and secure. For example, since all drivers are running in user mode on a driver server, a bug in a driver cannot crash the whole ...

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