like Microstrategy have given this some serious consideration and have released a private คลาวด์ enterprise edition of Microstrategy 9. MicroStrategy components are packaged as Virtual Appliances and tuned for expected load. These Virtual Appliances contain fully configured software components and the number of running virtual appliances can be adjusted to accommodate specific performance goals. This is a damn sight better than just saying to a customer “it’s up to you, just deploy it and you figure out the virtual server configuration” What Microstrategy have done is to allow you to adjust the underlying assigned physical resources to satisfy performance demands and have made available administrative facilities to control virtualized MicroStrategy environment.
It is early days in คลาวด์ based BI. I recommend looking at your requirements and then match the options available to your needs