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ALS 2000 Abstract
Linux-HA Heartbeat System Design
Alan Robertson, SuSE Labs
Abstract
One of the most commonly identified features which is felt to be necessary for LinuxTM to be considered
"enterprise-ready" is High-Availability. High-Availability (HA) systems provide increased service availability
through clustering techniques.
HA clusters minimize availability interruptions by quickly switching services over from failed systems to
working systems, providing the customer with an illusion of continuous availability. As such, high-availability
features, are vital to mission-critical systems. Although there are many components to a high-availability system,
two of the key components are heartbeat services and cluster communication services. Heartbeat services provide
notification of when nodes are working, and when they fail. In the Linux-HA project, the heartbeat program
provides these services and intracluster communication services.
This paper describes the design of the heartbeat program which is part of the High-Availability Linux
Project with particular emphasis on the rationales behind key design choices, and the results obtained.
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