For newbies it can be hard to learn about data centers. One document that is useful is Google published The Datacenter as a Computer paper back in 2009.
The Datacenter as a Computer: An Introduction to the Design of Warehouse-Scale Machines
And the closing conclusion.
Computation is moving into the cloud, and thus into WSCs. Software and hardware architects
must be aware of the end-to-end systems to design good solutions. We are no longer designing
individual “pizza boxes,” or single-server applications, and we can no longer ignore the physical and
economic mechanisms at play in a warehouse full of computers. At one level, WSCs are simple—
just a few thousand cheap servers connected via a LAN. In reality, building a cost-efficient massive-
scale computing platform that has the necessary reliability and programmability requirements
for the next generation of cloud-computing workloads is as difficult and stimulating a challenge as
any other in computer systems today. We hope that this book will help computer scientists understand
this relatively new area, and we trust that, in the years to come, their combined efforts will
solve many of the fascinating problems arising from warehouse-scale systems.