The following is Tip #9 from "25 Exchange 2003 Tips in 25 minutes." This content is excerpted from Scott Schnoll's...
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To improve performance for these large systems, three registry entries were often simultaneously adjusted to increase the maximum number of file handles that could be opened by the SMTP service (so that more messages could be processed) and to decrease the number of open file handles for the installable file system, another Exchange component (to avoid running out of memory when the queue is large). These registry values, which did not exist by default and therefore needed to be added manually, are listed here.
MsgHandleAsyncThreshold entries would be set to the same value (some value greater than 1000), and the FileCacheMaxHandles entry would be reduced from 800 to 600.
Exchange 2003 dynamically calculates the appropriate settings for SMTP files handles, so these settings are no longer needed. Therefore, before upgrading any Exchange 2000 servers with these settings to Exchange 2003, you should delete the entries from the registry.
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About the author: Scott Schnoll, an Expert on SearchExchange.com, is an MCT, MCSA and a long-time Microsoft Most Valuable Professional (MVP).
In addition to writing "Microsoft Exchange Server 2003 Distilled," he is a co-author of the upcoming "Exchange 2003 Resource Kit from Microsoft Press" and lead author for "Exchange 2000 Server: The Complete Reference."
Scott has written numerous articles for Exchange & Outlook Magazine, and is a regular speaker at Microsoft conferences, including MEC and TechEd, as well as industry conferences such as Comdex and MCP TechMentor, where he covers topics such as Exchange, clustering, Internet Information Services and security.