In this chapter, we will present some examples of high-availability systems solutions offered by both manufacturers of information processing systems and operating systems suppliers.
We can divide these solutions into two main categories:
We should note that theoretically these two types of solutions are non-exclusive and that it is possible to combine the two approaches within a single system. In practice, however, systems tend to end up in one or the other of the categories, for reasons of development cost. We proceed then to a comparison of these solutions. Here we must note that implementing a software-based solution requires that the hardware platform ...