The document discusses cloud computing and its essential characteristics, which include on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. It outlines various cloud service models, including Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Additionally, it covers enabling technologies such as virtualization, grid computing, and the Internet, highlighting the benefits and challenges of these technologies.

1. Cloud Computing
and cloud enabling Technologies
Abdelkhalik Mosa
abdelkhalik.mosa@manchester.ac.uk
https://www.linkedin.com/in/abdelkhalikmosa/

2. What is a Datacentre?

3. Traditional Datacentres
TIME
ITCAPACITY
Actual Load
Allocated
IT-capacities
“Waste“ of
capacities:
UNHAPPY CFO 
“Under-supply“ of
capacities:
UNHAPPY CEO 
Fixed cost of IT-
capacities
Load Forecast
Barrier for
innovations

4. Cloud Computing

5. Essential Characteristics
• Available once needed without requiring
human interaction with each service provider.On-demand Self-service
• Capabilities are available over the network.
Broad Network Access
• Resources are pooled to serve multiple
consumers using a multi-tenant model.Resource Pooling
• Resources are easily provisioned, released and
scaled.Rapid Elasticity
• A pay-per-use or charge-per-use basis.
Measured Service

6. Deployment Models
http://transformcustomers.com/cloud-computing-benefits-and-challenges/

7. Cloud Services Models)
Infrastructure
(as a Service) (IaaS)
Storage
Servers
Networking
OS
Middleware
Virtualization
Data
Applications
Runtime
ProviderManage
YouManage
Platform
(as a Service) (PaaS)
Storage
Servers
Networking
OS
Middleware
Virtualization
Data
Applications
Runtime
ProviderManage
YouManage
Software
(as a Service) (SaaS)
Storage
Servers
Networking
OS
Middleware
Virtualization
Data
Applications
Runtime
ProviderManage
Private
(On-Premises)
Storage
Servers
Networking
OS
Middleware
Virtualization
Data
Applications
Runtime
YouManage

8. IaaS Examples
Common SaaS Use-Case: Build or extend datacentre

9. PaaS Examples
Common SaaS Use-Case: Increases developer productivity and faster to the market

10. SaaS Examples
Common SaaS Use-Case: Replaces traditional on-device software

11. Cloud Enabling Technologies (CET
CET
Grid
Computing
Utility
Computing
The
Internet
Multi-
tenancy
Web 2.0
SOA
Automation
Virtualization

12. Grid Computing

13. Utility Computing

14. Utility Computing
http://invisibleadmin.com/images/utilitycomputingconcept.jpg

15. Virtualization
• Hardware or Platform
• OS
• Network
• Storage
• Application

16. Hardware/ Virtualization
• Creation of a VM that acts like a real computer with an OS.
• Platform virtualization has two different models:
• Type 1 – Bare metal
• Type 2 – Hosted.
Full virtualization
Paravirtualization

17. Full virtualization
http://ptgmedia.pearsoncmg.com/images/chap1_9780133570182/elementLinks/01fig02.jpg

18. Paravirtualization (PV
• PV is an efficient and lightweight
virtualization technique introduced by the
Xen Project team.
• PV does not require virtualization extensions
from the host CPU. However, PV guests and
control domains require kernel support.
• In PV, the hardware environment is not
emulated; however, the guest programs are
executed in their own isolated domains.

19. Internet

20. Multitenancy
http://whatiscloud.com/multitenant_technology/index

21. SOA
http://www.service-architecture.com/articles/web-services/service-oriented_architecture_soa_definition.html

22. Web 2.0
http://electronicportfolios.org/web2/class/web-2.0-concept.jpg

23. END