Cloud computing is a pay-per-use model for enabling available, convenient, on-demand

access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider

interaction.

Definitions of Cloud Computing

Clouds are hardware-based servicesoffering compute, network and storage capacity where:

▪ Hardware management is highly abstracted from the buyer▪ Buyers incur infrastructure costs as variable OPEX

▪ Infrastructure capacity is highly elastic (up or down)

Quotes

“Cloud computing has the potential to create irreversible changes in how computers are used around the world”

“Cloud computing technology’s objective is to move any application stored on a computer to a remote

location, eliminating all the standard components, including operating systems and hard drives, which are necessary in today’s computers and make them

accessible online through a standard browser. “

Simple Cloud Definition

Resources As A

Commodity

That’s 3 servers, 15 licences, 4 routers, 2

networks…. Do you have an online webshop

for me?

AS A SERVICEInfrastructurePlatformSoftware

Deployment Models

• Setup your own cloud-service• Datacenter on SOAP• Basic costs: – Connectivity– CPU– Storage

• Direct and On-Demand Provisioning• Differentiated by smart network services

Infrastructure As A Service

• Specific platform that is programmable.• Infrastructure transparent• On demand up and down scaling• Provide a technology lock-in• Reseller models for applications• Samples: Google AppEngine, Salesforce.com, ZOHO

Platform As A Service

• ASP application with cloud characteristics• Integration standards are missing• Possible lock-in• Fast growing segment with startups:– Photo/Video sites– Consumer Financials– Social

Software As A Service

Factors

GRID

OnlineApps

Connectivity

Outsourcing2.0

Green IT

Costs

Privacy2.0

1. Cost reduction. Focus on operational expenses.2. Flexibility. IT support should be up to web-speed.3. High level SLA.4. Usage based cost model.5. Easy upscaling. 6. Less maintenance. Less visible technology.7. Open standards.8. Easy to control and maintain.

Type Of Clouds

• Public Clouds– Everything for the end-user

• Private Clouds– Plain Old Data Center Infrastructure (mostly NOT!)– On-premise Cloud– Off-premise Specialized Cloud

• Hybrid Clouds– Surge computing (on demand capacity)

About the Economy Of Scale

Video of container based datacenter

Rules of the supermarket apply:- Just-In-Time planning- Demand based warehouse management- Operational excellence- A tiny optimization can already lead to profit- Expensive in CAPEX, low in OPEX