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Microsoft Forefront UAG 2010 Administrator's Handbook by Ran Dolev, Erez Ben-Ari

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Load balancing and high availability

Opting to employ several servers for high availability is a prudent step in most modern organizations, and thus, UAG includes built in support for arrays and NLB. Some organizations may still prefer using third party hardware, like F5 BigIP or Citrix Netscaler. The common scenario for load balancing would be to have several UAG servers running an identical configuration, and using a load balancer on the "external" side to distribute the load between the servers. Another scenario is when an organization has multiple internal servers, like a SharePoint server farm, and uses a Load-Balancer between it and UAG. Naturally, some organizations have both.

The most important consideration in a high availability scenario ...

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