I/O Performance

Theo Lachev explains in his Blog why the SQL Profiler does not tell you the truth about I/O waits in SSAS: it's "because the Started/Finished reading data from the partition events include also the time spent in aggregating data and this time may be significant". He suggests to use the Xperf tool from the Windows Performance Toolkit instead and provides links to some short introductions that show how to use the tool.

Apart from this he also suggests to use solid state disks (SSD) when the storage engines spends a lot of time reading data (but "There needs no Ghost, my lord, come from the grave/To tell us this.")