Exchange Publishing – UAG Performance


Here are the details of a recent test cycle our performance lab conducted for publishing Exchange with Unified Access Gateway (UAG) RTM. It should be noted that all sorts of factors impact performance, such as usage profiles, published applications, hardware, etc. With Exchange, results are also impacted by the overall usage ratio between the different mail services, Outlook Web Access, Outlook Anywhere, and ActiveSync.

The details of the scenario are as follows:

Published Exchange Applications

Authentication Details

Ratio (of overall usage)

Outlook Web Access

Outlook Web Access Look and Feel with Basic authentication against the Client Access Server

50%

Outlook Anywhere and Web Services

Clients authenticating with UAG with NTLM, and using KCD between UAG and the Client Access Server

40%

ActiveSync

Basic authentication

10%

Results for a single test server running Forefront UAG (RTM build 1101):

Hardware:

Processor

2 Quad-Core Intel Xeon 5500 Series

Memory

24 GB RAM

Network Interface

Gigabit Ethernet

Results:

Number of concurrent users

16,000

CPU utilization

85%

Memory usage

44%


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