Positioning XD Compute Grid- Role of JZOS JES J2SE JVM ZFS JZOS Launcher JZOS API’s HFS Java JCL VSAM JZos delivers 2 technologies: 1. JZOS Launcher- seamless way to initialize a J2SE runtime from JCL 2. JZOS API’s- set of library functions for accessing traditional z/OS resources (MVS datasets, VSAM files, etc) from Java JZOS launcher not efficient for 1000’s of batch jobs to be run within a batch window J2SE JVM has no: - security, transaction, or connection management - checkpoint or restart facility for batch jobs - inherent high availability, or other WAS z/OS qualities of service JVM is not persistent or reusable. Great to get started… Second, the role of Compute Grid and JZOS; JZOS is a technology for enabling java on z/OS to access and leverage traditional z/OS facilities. This technology is composed of two components: first is a launcher, whose job is to efficiently initialize a J2SE runtime from JCL; second are the programming interfaces available to applications for accessing traditional z/OS resources such as datasets. The JZOS launcher technology initializes a J2SE runtime; a runtime that lacks features such as: transaction, security, and connection management; checkpoint and/or recoverability facilities for batch jobs; inherent high availability and other WebSphere qualities of service provided by enterprise middleware such as WebSphere. The JZOS programming interfaces (API’s) serve a different purpose than the launcher

Mainframe Java Batch – Relative Base-line Cost CPU time spent on JVM startup JZOS WebSphere Batch (Compute Grid) Number of job steps

Positioning XD Compute Grid- Role of JZOS Enterprise Scheduler ZFS WAS z/OS JES JZOS API’s HFS XD CG Op. Plan JCL VSAM XD Compute Grid is built on WebSphere z/OS leverages QoS and services provided by the WAS z/OS runtime (security, transaction, connection management; thread pooling; HA, etc) Runs within a persistent, reusable JVM and Execution Container JZOS Api’s can be leveraged from XD CG applications JZOS Api’s provide a strong integration point for Java and traditional z/OS The programming interfaces can be leveraged by Compute Grid applications, enabling these applications to access traditional z/OS artifacts such as ZFS, HFS, VSAM, and others. The JZOS programming interfaces coupled with Compute Grid delivers a strong integration point for enterprise java batch applications and traditional z/OS.

Grow into Compute Grid Batch Application BDS Framework Batch Application Batch Simulator BDS Framework JZOS/J2SE Compute Grid Start with JZOS or J2SE-based Java batch infrastructure Grow into Compute Grid-based Java batch infrastructure Leverage FREE Compute Grid development tools and frameworks to build Compute-Grid-Ready batch applications