Unix® System Management Primer Plus

Chapter 10

1:	What is the difference between high availability and fault tolerance?
A1:	Fault tolerance guarantees 100% uptime by providing redundant hot-swappable components and software to support them. High availability provides automated mechanisms by which a service can remain available when individual components fail, but it does not guarantee 100% uptime; there may be short outages if components fail.
2:	What characteristics of a network service make it a good candidate for the “least connections” methods of load balancing?
A2:	Network services using the “least connections” method of load balancing should have long-lived (at least 5 seconds), nonidle network connections. In these situations, the load on any particular system is usually directly ...