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Macromedia JRun 4 Macromedia JRun 4 : ClusterCATS
Macromedia ClusterCATS is clustering technology that provides load-balancing and failover services to assure high availability for your web servers. ClusterCATS lets you cluster distributed servers into a single, high-performance, highly available environment of web server resources. ClusterCATS is only available for use by licensed JRun 4 customers and requires a valid JRun 4 serial number to install.

A cluster consists of two or more web servers located on a LAN or across a WAN. Web servers included in a cluster operate as a single entity to provide rapid and reliable access to resources on those web servers. A cluster can help your website avoid the consequence of busy and failed servers: slow networks. With ClusterCATS you can avoid bandwidth, latency, and congestion problems.

Download ClusterCATS for the operating system your servers are running:



ClusterCATS-5.1-w32.exe (6.89MB)


clustercats_linux.tar.gz (4.82MB)


clustercats.pkg (12.87MB)

For more information, read the ClusterCATS release notes or read the documentation "Using ClusterCATS" (PDF, 1.9 MB).