Linfeng Yu

Subscribe to Linfeng Yu: eMailAlertsEmail Alerts
Get Linfeng Yu: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


Top Stories by Linfeng Yu

WebSphere Application Server (WAS) for z/OS is IBM's z/OS implementation of the J2EE server design. To build robust and efficient WAS environments on z/OS, you must determine the topologies that address your needs. Since WAS for z/OS is middleware, the topologies can become quite complex and require forethought. Considerations should be given to scalability, availability, and factors such as security, performance, and administration. zSeries platform technologies have great impact on WAS for z/OS topology, scalability, and availability. Let's start with zSeries technologies. Important zSeries Concepts To Understand Today's zSeries Servers run in logical partition (LPAR) mode as shown in Figure 1. zSeries LPAR, delivered via the Processor Resource/System Manger (PR/SM), is a very mature server virtualization technology that improves server utilization and overall syste... (more)

Understanding WAS for z/OS

WebSphere Application Server for z/OS is a comprehensive and sophisticated J2EE application server platform. It integrates with the IBM's zSeries portfolio of hardware and z/OS software assets and exploits the qualities of service of the platform such as close proximity to data, intense scalability, continuous availability, failover support, and stalwart security. Most developers working with WebSphere for z/OS today don't have IBM zSeries server experience. They'e good at J2EE and are more familiar with WebSphere on distributed platforms. This article intends to help folks unders... (more)

IBM WebSphere Application Server - WAS for z/OS and DB2

Most WebSphere Application Server (WAS) for z/OS customers use DB2 for z/OS as the backend or data store. DB2 for z/OS is a high-performance DBMS, with a strong reputation for handling high-volume data access transactions. Picking the right WAS for z/OS and DB2 Subsystem connectivity architecture can greatly improve the system's performance, availability, scalability, security, and transactional capability. On the other hand, application developers are always confused by some of the WAS for z/OS DB2 application development concepts such as local transaction, JDBC connection shar... (more)

WebSphere Application Server for z/OS and zAAP: Manage Costs While Gaining Benefits

Running applications in WAS for z/OS lets you take advantage of the z/OS built-in Quality of Service features such as reliability, availability, scalability, and serviceability. However, the solution could be very expensive. J2EE applications and WAS for z/OS are very CPU-intensive workloads on z/OS. They consume a lot more CPU cycles than the traditional workloads running on z/OS, especially when processing big XML files. Normally the CPU utilization of an application running on z/OS is measured in MIPS. An application consuming more CPU cycles means that the MIPS number for t... (more)

WebSphere Cover Story — ESB Implementation with WAS for z/OS V6

More and more companies are starting to adopt Service Oriented Architecture (SOA) - a framework for integrating business processes and supporting IT infrastructure as secure standardized components or services that can be reused and combined to address changing business priorities. Enterprise Services Bus is an important architectural element in a SOA. This article will discuss how to implement an ESB with WAS for z/OS V6. The ESB Concept We all know that SOA is an approach to define integration architectures based on the concept of a service. When you enable service interactions u... (more)