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What do you need load balancing for?

"We've been using load balancers from Loadbalancer.org on our high traffic web application since 2004 - and never had a single failure. The hardware and software has performed flawlessly for over 10 years. It was easy to setup and has been easy to maintain. And the support has been fantastic. I have no reservations recommending this product to anyone who needs a HA load balancer solution."

Brook Davies

Logiforms Software

Load Balancing Nuance Output Manager

Output Manager is an enterprise document management and printing solution from Nuance. It enables the centralized management of enterprise document output. Output Manager consolidates input from multiple platforms and applications and centrally manages resources and documents.

Deployment Mode

For load balancing Output Manager we recommend Layer 4 Direct Routing (DR) mode, aka Direct Server Return (DSR). However, Layer 4 NAT, Layer 4 SNAT & Layer 7 SNAT can also be used. Deciding which method is best for your deployment depends on a variety of factors. Layer 4 DR mode is the fastest method but requires the ARP problem to be solved and also requires the application running on the real servers to respond to both its own IP address and the VIP. Layer 4 NAT mode requires that the default gateway on the real servers is the load balancer. Layer 4 SNAT mode requires no real server changes, but unlike the other Layer 4 methods, is non-transparent. Layer 7 SNAT mode is also non-transparent and requires no real server changes, but does not offer the raw throughput of the Layer 4 methods.

Layer 4 DR Mode is a very high-performance solution that requires little change to your existing infrastructure. It is necessary to solve the ARP problem on the real print servers. This is a straightforward process and is detailed in the section “Configuring Print Servers for Load Balancing” which can be found in the deployment guide. If you cannot make changes on the print servers, then we would recommend using Layer 7 SNAT Mode. Due to the increased amount of information at Layer 7, performance is not as fast as at Layer 4. Also note that load balanced connections at Layer 7 are not Source IP transparent, which is not usually an issue when load balancing print servers but should still be considered.


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