Blue and Red Gradient - University of Wisconsin-Platteville蓝色和红色的梯度-威斯康星大学普拉特维尔.ppt

Explanation of Technology Usage-based computing Term refers to “cloud” concept of Internet Data and software stored on remote server Accessed via web browser or other system on clients computer Each server holds multiple virtual machines for different software User is charged for access to software and data Explanation of Technology (cont.) Differences from Grid Computing Grid computing uses power of distributed PCs to achieve a common goal SETI@home Cloud computing uses server to provide for thousands of clients Hurdles in Development How long will data be maintained? How can customers be insured against service outages or data loss? How will users switch data from one provider to another? How will providers handle hosting proprietary software? Hurdles (cont.) - Security Internet is not a safe medium as of right now Cloud computing may not be an option for hospitals, government institutions, etc. Possible solutions: Encode information before sending it across cloud (SSL/TLS) Private cloud for large companies: provider and client protected by firewall Major Players Google Google Docs AppEngine Used to create web applications to be used in cloud computing Scales easily, but does not allow programmer much freedom Major Players (cont.) Microsoft Azure Programmers can choose almost any language Most applications supported Scales somewhat easily Programmer enjoys modest amount of freedom Major Players (cont.) Amazon Elastic Compute Cloud Programmers have control of almost entire system Supports virtually every language Treats each VM as though it were an independent machine Major issues with scalability Future Up-to-date software: Client does not need to find patches for programs Truly portable access points: Laptops, cell phones, Blackberries, etc. Small businesses will have access to IT benefits previously enjoyed only by large corporations Future (cont.) - Brokers Brokers buy large shares of computing power from multiple providers When a client needs quick, tempora