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What do you need load balancing for?

"With the implementation of this solution, we are able to provide a fully redundant, load-balanced, highly efficient and always available solution for our print-on-demand customers around the world."

Lookman Kurusumuthu

Ricoh Canada Inc

Load Balancing Nuance Autostore

AutoStore is a server-based, enterprise document capture and handling solution from Nuance. It enables the capture and secure delivery of paper, electronic documents and data into business applications from a wide range of capture points. It is well suited for organisations of all sizes who want to eliminate error-prone manual document handling.

Deployment Mode

For load balancing AutoStore 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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