If you are processing your AS cube using impersonation mode, if you incorrectly place the impersonation information as MYDOMAIN/UserName instead of MYDOMAIN\UserName, you may crash or hang Analysis Services. A quick cursory examination noted that with Sybase and DB2 relational data sources, AS ended up crashing. If SQL Server or Oracle is your relational data source, then the processing is exceedingly slow to the point where the server was hanging; in the end eventually failing.
Thanks to John Lam, Nicholas Birke, and Wei Zhang
thanks