ClusterCATS Supported Platforms Update
ClusterCATS is a software-based load-balancing and fail-over enabling technology for web servers running ColdFusion and JRun. It layers on web servers and is ideal for small to medium sized sites that sustain moderate traffic but which require high availability, or need load balancing to maximize machine resources. Supported ClusterCATS features and platforms are listed below.
- ClusterCATS 5.1 (ColdFusion MX and MX 6.1, JRun 4.0)
- ClusterCATS 5.0 (ColdFusion 5)
- ClusterCATS 4.0 (ColdFusion 4.5, JRun 3.x)
Other configuration information:
Microsoft Network Load-balancing:
Microsoft Network Load-balancing (MS NLB) will not work with ClusterCATS. MS NLB takes a single IP address and populates it across multiple servers, while ClusterCATS takes multiple fully qualified host names and clusters them together to work in concert with DNS Round Robin. In order to make the transition from NLB to ClusterCATS, or from ClusterCATS to NLB, you must make changes both in DNS and on the web servers. MS NLB lacks the ClusterCATS feature set important to ColdFusion and JRun users: application server and web server probes, alarms & reports, sticky-server or session-awareness, application-smart load-balancing algorithms, etc., but it is available on IIS6 which ClusterCATS does not support.
Hardware Load-balancing Devices:
You may employ ClusterCATS in concert with a hardware-based solution such as BIGIP, CSS, ServerIronXL, ACEDirector, etc. In the passive mode, ClusterCATS will pass dynamic feedback protocol traffic to CSS and CLD; its probing feature will restart stalled web servers and application servers and the alerting and reporting features will function as designed.
Macromedia engineering is aware of these issues and is currently investigating possible resolutions.
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