The document discusses key concepts about cloud computing including: 1. The cloud provides on-demand computing resources that can be dynamically scaled without physical infrastructure changes. Users pay for only the resources they use. 2. There are different types of cloud including public, private, and hybrid clouds as well as different cloud services like computing, storage, databases, and more. 3. While cloud computing provides significant economic benefits and flexibility, enterprises have been slow to adopt clouds due to concerns over performance, security, privacy, and lock-in to certain vendors.

2. What is the cloud?

3. http://img.dailymail.co.uk/i/pix/2008/04_01/tornadoDM3030a_800x533.jpg

10. Major types of cloud http://www.eo.ucar.edu/webweather/cloud3.html

11. Component vs. service Web App DB DB App App Storage services VM VM VM VM VM VM App cluster Add instances to grow Rewrite for scalability Storage services Code Storage Layout Auth Cloud APIs Other services

12. Centralized vs. distributed Amazon AT&T

17. But enterprises lag

18. Pay-as-you-go looks great to cash-poor startups Unknown/variable Known/fixed Variable

19. So what’s stopping the enterprise?

20. Performance & availability

23. Do you really want to give users unlimited access? http://debroffdebrief.clubmom.com/debroff_debrief/2007/04/dont_forget_to_.html

24. Lock-in Formal Proprietary APIs and languages Informal I can’t build it myself even if I want to

30. What to watch

31. Hosting companies that make the jump

32. Stack-specific clouds

33. Who’s got network effects? feed.API (facebook) > feed.api (friendster)

34. Virtual appliances Cisco Nortel F5 Juniper Stomp IPChains Vyatta Checkpoint Hardware Software

35. Tools to wrangle virtual machines

36. Testing sandboxes

37. Application delivery networks

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