Fault isolation
In the simplest application of failover, we are only concerned with clean failures of an individual server, in which a server simply ceases to function completely, but this failure has no effect on the health of other servers. However, there are sometimes situations where one malfunctioning server may in turn create problems for the operation of other, otherwise healthy servers. For example, one malfunctioning server may hoard system resources, or database resources, or hold critical shared objects for extended periods of time, and prevent other servers from getting their fair share of access to these resources or objects. In this context, some configurations may provide a degree of fault isolation, in that they reduce the potential for the failure of one server to affect other servers.
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