Load Balancing using Layer 4 Switching is a very popular method of creating large Internet sites using commodity hardware. To avoid having a single point of failure two directors are often deployed in an active/stand-by configuration to load balance a site. However, when fail-over occurs, active connections will break unless they are synchronised between the two directors. This paper examines how the current connection synchronisation code works in the Linux Virtual Server and looks at improvements that have been made to this code-base.
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