The use of hardware load balancers allows you to run multiple K2 Servers and/or Web Front Ends as if they were one point of entry. This KB describes the SourceCode support policy for K2 software running on hardware load balancers.
 

Except as described in this article, SourceCode does not explicitly test or support K2 software running on hardware load balancers. If you have Technical Support and Maintenance services from SourceCode, SourceCode will investigate potential issues with K2 software running within hardware load balanced environments, provided technical requirements for the hardware load balanced environments are met. These details are described in the following topic in the documentation:

http://help.k2.com/helppages/k2blackpearlgettingstarted4.6.7/webframe.html#Before_SettingupNLB.html.

SourceCode may require that customers replicate the issue on Windows Network Load Balancing to proceed with the investigation. This request to replicate issues on alternative load balancing is used to verify that the problem exists in the SourceCode software independent of the underlying platform. Where it is determined that the issue is not related to hardware load balancers, K2 software will be supported in a manner that is consistent with support provided when the software is on Windows Network Load Balancing.