Abstract:

 The terms Redshift and Blueshift capture an significant change in the way
 companies use their IT infrastructure and the role of IT in the  business.

 We give a definition of Redshift and Blueshift that  captures this 
 difference and then explore the characteristics of data  centers built for
 these different types of roles. In particular, the  architecture data 
 centers targeted for these two different roles is  quite different. One 
 illuminating way to explore the these  differences is by looking how 
 virtualization enters into the  data center architecture and to compare 
 the different virtualization approaches  taken by different data centers.