1. INTRODUCTION TO CLOUD COMPUTING CS 595 LECTURE 2

2. DATA CENTERS Distributed Servers Distributed data centers geographically separated Robust if failure Dynamic datacenter so can increase as needed

3. LARGE DATA CENTERS Although Google is famous for innovating web searching, Google’s architecture as much a revolution Instead of few expensive servers, use many cheap servers ($5000 instead of $100,000) 1/2M servers in ~ 12 locations) With thin, wide network Derive more from scale of the whole than any one part – no hub Cloud – robust and self-healing Uses a lot of power Need cheaper power solutions

4. DATA CENTERS Redundancy Redundancy is the key to the success of clouds Google approach – cheap components that fail, so replicate all processing and storage Efficiency Utilization Management Virtualization

5. These public clouds are great, but what if an organization wants to build their own local cloud? 5

6. LOCAL CLOUD ARCHITECTURES IAAS Local Cloud? Small to medium sized What resources would we need to do this? Compute Servers Persistent Storage Servers VM Image Server(s) Cloud Administrative Server(s) Network Infrastructure Copper 6

7. LOCAL CLOUD ARCHITECTURES IAAS Compute Servers CPU, RAM, Local disk (magnetic, SSD) resources given to the user. In the form of virtual machines. Hosts virtual machines using a hypervisor Software that creates and run virtual machines Xen, KVM, ESXi Grid VGX Hybrid approach to hypervisor selection is common. Windows Linux Mac OS X 7

8. LOCAL CLOUD ARCHITECTURES IAAS Persistent Storage Servers What they are: VMs hosted on the compute servers are stateless. What they do: Used for long term storage of data. Virtual Machine Image Server Modified Persistent Storage Server. Repository of available VM images. 8

9. LOCAL CLOUD ARCHITECTURE IAAS ARCHITECTURE 9

10. QUESTIONS TO ANSWER THIS SEMESTER 1. IS CLOUD COMPUTING JUST A BUSINESS MODEL AND NOT A COMPUTING MODEL? 2. IS THERE ANYTHING NEW IN CLOUD COMPUTING OR IS IT JUST DISTRIBUATED COMPUTING WITH A DIFFERENT NAME? 3. IS IT REALLY ALL ABOUT MONEY??