The latest Endpoint Encryption Manager Administration Guide.pdf states the following.
There is no requirement for any particular type of directory within as long as the directory engine can support the minimum layout. All data sources are viable, e.g. ODBC, Access, LDAP, DAP, X500 etc. Endpoint Encryption ships with two directory drivers, one, a high performance file system based driver for large corporate users, and a small single-file "transport" directory driver designed for single use and disconnected deployment. For information on porting Endpoint Encryption's backend directory to an alternate system, please contact your McAfee Services representative.
we have ported to SQL in the past, but it was soooo sloooow that it never went anywhere.
There's no good reason to do it at the moment - SQL may be a great database, but it's an awful policy store. What we have at the moment is much faster, much more robust, and more secure than if we did it via SQL.
Do you have any metrics of how much a query on a server with ca. 30.000 machine & approx. the same amount of users should take? I'm talking about a basic query to find a computer account. Or is there any manual that would state such information?