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1、WEB应用加速研讨,Presented by:,Users,Data Center,The Leader in Application Delivery Networking,SAPMicrosoftOracle,At HomeIn the OfficeOn the Road,Business Goal: Achieve These Objectives in the Most Operationally Efficient Manner,议题,F5公司简介银行应用加速研讨关键技术介绍讨论问答,银行Web化应用的问题,传统解决方案,扩大带宽无法真正的解决问题在营业网点数量巨大时，再低廉的带宽扩
2、展也会带来巨大的成本分布式Cache方式部署代价高昂管理控制复杂无法实现集中管理需要负载均衡机重定向或者采用高损耗的WCCP采用对称式加速设备需要双端部署价格高昂管理维护复杂当部署在骨干网上时对各种应用的影响未知并非针对HTTP协议,F5 ADN 解决方案-WebAccelerator,Web Accelerator是一个独立设备 (将来会是BIGIP上的模块)用于:Web 应用 (http and https)比较慢或有远程访问用户的Web应用在动态内容时非常显著 (当然也可以处理静态内容了)Enterprise, Portal, and E-commerce Web 应用:MS Share
3、Point, Outlook Web Access,等Oracle OAS, 11i, e-Business Suite, 等SAP, Siebel, PeopleSoft, 等IBM WebSphere, BEA WebLogic, Sun iPlanet其他 (Plumtree, Hyperion, Vignette, Lotus Domino),很少或基本上不用改动现有的应用环境,WebAccelerator 如何运作?,Browser 行为控制 用户不需要下载重复的页面和内容内容加速更多并发的browser 连接PDF文件的平滑显示（下载部分显示部分，不是全部下载后再显示）加速动态内容
4、*适用增强的压缩，代理和其他技术Reporting 和 LoggingGraphs, Charts, Alerts, etc统一的log Web应用的 “hits”,WebAccelerator 功能,IBR（Intelligent Browser Referencing） :Express LoaderExpress ConnectExpress DocumentsExpress PagesApplication Smart Caching (Dynamic Caching)Intelligent Compression,Web代理,TCP优化,HTTP压缩,IBR,Server,Clien
5、t,Network,加速的重点,Network Offload Server Offload Application Offload,Network Offload,这里发生了什么?,Network Offload需求的原因,Bandwidth Throughput,更大的带宽不意味着更多的流量Whitepaper at http:/ (Myths of Bandwidth),Web Accelerator减小数据传输,浏览器本地Cache,Web Acc Compress减小数据传输量浏览器行为控制使更多的内容保存在浏览器本地,服务器,Server Offload,这里发生了什么?,Serv
6、er Offload 的需求原因?,WebAccelerator 卸载过载的服务器,Browser 使用 IBR加速,F5加速下载和卸载服务器压力,卸载过载的服务器,静态和动态的Caching,第一次请求,Compression,Cache,下一次请求,Cache,减少用户延迟,存储压缩和未压缩的内容,内容服务卸载 Server连接卸载,本地Cache,改变内容部分,未改变部分,Application Offload,这里发生了什么 ?,Application Offload 的需求原因?,WebAccelerator Functionality,The advanced accelerati
7、on features of the Web Accelerator are:Express LoaderExpress ConnectExpress DocumentsExpress PagesApplication Smart Caching (Dynamic Caching)Intelligent Compression,Web Accelerator的主要工作,智能浏览器行为控制Intelligent Browser Referencing (IBR),与传统Cache不同的是，Web Accelerator尽可能的将数据Cache在客户的浏览器端动态内容级Cache，与URL无关本机
8、Cache刷新时间可以为零,Express Loader,When a user requests a page from a site the normal browser behavior is to check each object to see if it appears in a local cache. If it does appear in cache, the browser makes a request of the server to check whether the content held locally is still valid.This mechanis
9、m reduces the amount of data transferred between user and server, however, each object still requires a connection to validate it, and therefore while the page load time can be reduced with standard browser caching, it is neither optimal nor efficient.Express Loader tags each HTTP object it sees and
10、 allows the web accelerator to control the browser cache much more efficiently then a typical application. This reduces the chattiness of the HTTP protocol and eliminates the latency inherent in the connection.Why is this good?Massively reduced download timeSuperior user experienceAll the benefits o
11、f Caching but never a fear of stale dataVery high server offloads which allow for increased capacity with existing infrastructureNo application/site changes required even if no-cache directives are hard coded.,Impact of Acceleration,FeaturesCompatible with any object typeBrowser and cache transparen
12、cyNo application changes requiredBenefitsReduces network and protocol delaysEliminates unnecessary upstream requests for objectsEnsures propagation of valid content,Stages Content In Browser & Downstream/Edge Caches,Web Applications,Clients,IBR 多线程连接,典型的Web应用连接,IE对同一个域名的访问只支持两个并发连接,WAN,IBR 多线程连接,标准I
13、E对同一个域名的访问只支持两个并发连接在通过Web Accelerator 加速后可实现多连接并发下载,IBR - MultiConnect,WebAccelerator,WAN,Express Connect,The standard browser can open only two simultaneous connections to a given web server. This limits the performance of the application and negatively impact user performance.The Web Accelerator c
14、an induce the browser to open as many connections as you specify to deliver the content in parallel over those connections.The WebAccelerator is a proxy and therefore buffers the server from actual users. This, in conjunction with server side connection-keep-alives allows new user requests to be pip
15、elined down existing/established connections.Why is this good?Superior user experienceNo application/site changes requiredOptimal implementation high latency connection, bandwidth over 256K.,Impact of Acceleration,BenefitsMakes more efficient use of the network Reduces wait times Divides the task of
16、 requesting and receiving objects among more connections,FeaturesHandles browser dependenciesEnables pipelining Transparent to the origin application,Enable the Browser to Increase Simultaneous Connections,Web Applications,100 pages,WebAccelerator,可以一次只传输一页,IBR 动态线性化,立即浏览PDF文档,Client,Express Documents,
