云计算的缺点.ppt

Details may vary somewhat by site or by moment in time. * Video download – external traffic Search application – internal traffice * Requests from Internet are IP (layer 3) routed through border and access routers to a layer 2 domain based on destination VIP address Single layer 2 domain – 4000 servers Layer 2 domain divided up into subnets using VLANs configured on Layer 2 switches * Target markets for the service * * Tradeoffs Load distribution vs service performance eg Facebook’s single master coordinate replication Speeds up lookup but loads on master Communication cost vs service performance Data replication-more inter data center communication Longer latency Higher cost message over inter DC links Data center costs Server, Infrastructure, Power, Networking Improving efficiency Network Agility Resource Consumption Shaping Geo-diversifying DC Richard Stallman, GNU founder Cloud Computing is a trap “.. cloud computing was simply a trap aimed at forcing more people to buy into locked, proprietary systems that would cost them more and more over time.” Its stupidity. Its worse than stupidity: its a marketing hype campaign Open Cloud Manifesto a document put together by IBM, Cisco, ATT, Sun Microsystems and over 50 others to promote interoperability Cloud providers must not use their market position to lock customers into their particular platforms and limit their choice of providers,” Failed? Google, Amazon, Salesforce and Microsoft, four very big players in the area, are notably absent from the list of supporters Larry Ellison, Oracle founder fashion-driven and complete gibberish” “What is it? What is it? ... Is it - Oh, I am going to access data on a server on the Internet. That is cloud computing?“ “Then there is a definition: What is cloud computing? It is using a computer that is out there. That is one of the definitions: That is out there. These people who are writing this crap are out there. They are insane. I mean it is the stupidest.” Sam Johnston,