Bulletproof WebSphere Architectures. Tony Higham, CTO Rare Medium. What We’ll Cover. Application Architecture Scalability and reliability Integrating Domino and WebSphere WebSphere V4 software architecture A typical development architecture An example production architecture
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Bulletproof WebSphere Architectures Tony Higham, CTO Rare Medium
What We’ll Cover • Application Architecture • Scalability and reliability • Integrating Domino and WebSphere • WebSphere V4 software architecture • A typical development architecture • An example production architecture • Where to Learn More
What is Application Architecture • An application architecture is ... • An application run-time environment (the stuff on which applications run) • Hardware, software, networking, etc. • Why should you care about architecture? • Success or failure of your applications depends upon it • A well-designed application will run poorly on a poorly-designed architecture
Application Architecture Goals • A good application architecture provides • An application environment that is easily extensible to provide more computing power as the number of users increases • An application environment that is resilient to hardware and software failure • Use scalable and reliable technologies to meet these architectural goals
Achieving Scalability • Design the architecture to use vertical and/or horizontal scaling • Vertical scaling with server software • Running multiple instances of server software on a single machine • Horizontal scaling with server software • Running multiple machines, each with a single instance of the server software • Both horizontal and vertical, combined
Why Use Vertical Scaling? • A single server instance rarely uses the maximum capacity of a machine • Software packages have different limits • Domino R4.6 uses maximum +/- 750 MB RAM • Use multiple instances to exploit the available CPU and memory resources • Beware of vertical scaling tradeoffs • Does not meet reliability goals • Performance improvement is not linear
Why Use Horizontal Scaling? • More reliable than vertical scaling • Removes single point of failure • Offers the best scaling performance • Performance improvement is near linear • The more systems you add, the faster it is • Biggest tradeoff is cost • One server per machine is costly • Best combined with vertical scaling
Achieving Reliability • Hardware reliability is often achieved with redundant CPUs, hot-swap drives, etc. • Combines with software redundancy to remove all single points of failure • Software redundancy services provide • Even distribution of work over servers • Reduces likelihood of failure due to high load • Redirection of user requests to other servers in the event of server failure
Designing an Application Architecture • Architecture design is a tradeoff between • Scalability • Performance • Reliability • Cost • You decide which tradeoffs make sense • Performance and reliability needs • Available budget for hardware/software
Integrating Domino and WebSphere • Integration occurs at the HTTP layer • Domino HTTP server, or • Microsoft IIS Web server • Domino and WebSphere single sign-on • WebSphere ships with SecureWay Directory, which Domino can use (LDAP) • WebSphere can use the Domino directory when it's LDAP-enabled • Single sign-on works in Domino R5.05
Analysis of the Development Architecture • Issues with this architecture • If the machine fails, you're out of business • Domino HTTP server has known issues • Performance, agents causing HTTP server crashes, etc. • How to improve this architecture • Use machines dedicated to specific tasks • Use a scalable and reliable HTTP server • HTTP server must integrate with Domino and WebSphere
Benefits and Tradeoffs • Benefits of this architecture • IIS has proven scalability and reliability • Improved security with second firewall • Hardware clustering removes single point of failure for database server • Tradeoffs with this architecture • IIS is the only other Web server that Domino and WebSphere can share • IBM HTTP Server (Apache) is not available!
Where to Learn More • SearchDomino.com • Admin2002 Conference • Detailed follow-on session with live demo • Fully documented procedures on CD • May 1 – 3 in Boston (see www.eview.com) • Articles in The View magazine • Ariticles in WebSphere Advisor magazine • The ITHumans Web site • www.ithumans.com • email@example.com
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