Another whitepaper to add to your “to read” list: SQL Server 2008 R2 Analysis Services Operations Guide
This white paper describes how you can test, monitor, capacity plan, and troubleshoot Microsoft SQL Server Analysis Services OLAP solutions in SQL Server 2005, SQL Server 2008, and SQL Server 2008 R2.
It describes how to remove production issues on even the largest scaled cubes, as well as providing guidance on how to configure the server for best possible performance.
This is a must-read for anyone working with SSAS.