Under principle of cloud computing

1. 1.2 The evolution toward
Cloud Computing

2. Overview of the Evolution of Cloud
Computing

3. 1.2.1Historictimeline
• Contributing factors to the existence of the Cloud
• The development of the Internet
• The move from Mainframe computing to the present day
myriad of personal devices with connection to the Internet.
• The development of computer networks
• Time-line
• Mainframe computers and terminals
• Decentralized mini computers with terminals
• Micro computers (PC) connected to a LAN with terminal
emulation
• Client-server architecture
• Any device connected to the internet

4. Minicomputers
• Easier to purchase
• Smaller
• Cheaper
• First specialized, later multi-
tasking
• Development of LAN

5. From Microcomputer to PC
• Smaller, smaller, smaller
• Single user > multi user
• Limited memory and storage
> limitless
• Elementary operating
system > multi OS

6. Local Area Networking

7. 1.2.2 Network and Servers
• Service forms
• Dial up with modem
• Dedicated leased-line
• Uses
• Dedicated terminal
• Access to time sharing
services
• Special services on
intelligent devices:
• Terminal server (remote
access)
• Batch processing (job
entry)

8. 1.2.3 The role of the Internet
• Initial vision: Intergalactic Computer Network
(Licklider, 1963)
• ARPANET (Advanced Research Projects Agency
Network, owned by the US Department of Defense,
1998)
• One protocol: the TCP/IP protocol (1983)
• One global and public network
• Internet services: www, ftp, smtp, http, …

9. 1.2.4 Virtualization
Not NEW!
• Exists since the 1970s in mainframe environments
Example: 1972 IBM VM/370

10. • Concept of the Cloud: virtualized operating
environment & thin clients; Web-based delivery
• Virtualization is the solution for integration of:
• Internet
• Storage
• Processing power
• Key Features are:
• Multiplies the use of high performance computers
• Puts extra/excess capacity to use
• Multi-tenancy

11. Six types of virtualization
• Access virtualization (access from any device)
• Application virtualization (platform and operating
system independent)
• Processing virtualization (one system becomes many)
• Network virtualization (enables artificial views of the
network)
• Storage virtualization (enables sharing, concealing,
etc.)

12. 1.2.5 Managed Services in the Cloud

13. • Advantages:
• Accessibility everywhere
• Shift of focus from IT to core business
• No need for highly trained IT staff
• Key Issues:
• Performance
• Compliance
• Contingency