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Achieving High Availability of WebSphere on z/OS through Failover and Timeout Configuration

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Elena Nanos
Elena Nanos

The document discusses achieving high availability for WebSphere Application Server on z/OS. It describes the clustered architecture with control/servant regions that allows for automatic failover. It provides recommendations for minimizing the effects of timeouts, including setting timeout values and delaying servant termination. It also discusses health check procedures, alerts, avoiding memory leaks with ThreadLocals, and tools for monitoring and debugging the environment.

Technologie
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Session 1783 – Part II ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 1
Why WebSphere on z/OS? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 2
Features and Technology Unique to z/OS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 3
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 4 Infrastructure Design with Focus on High Availability
WebSphere on z/OS Failover and Recovery ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 5
HCSC WebSphere on z/OS environments ,[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 6 Unit and String Integration Test ,[object Object],System Integration Test User Acceptance Integrated Acceptance Load and Performance ,[object Object],Development Path to Production Our WebSphere on z/OS infrastructure has been architected to support development, testing and Production deployment in the following environments:
Sample WebSphere on z/OS Cells configuration (naming convention has been changed to protect our environment) Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 7
Failover - Servant Outage ,[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 8 LPAR B Q3LP5 Cluster Undispatched work ,[object Object],[object Object],[object Object],[object Object]
Minimizing Effects of Timeout ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 9
Setting Read timeout on Client Call ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 10 import org.springframework.remoting.jaxrpc.JaxRpcPortProxyFactoryBean; import javax.xml.rpc.Stub; public class MyJaxRpcPortProxyFactoryBean extends JaxRpcPortProxyFactoryBean { private static final String TIMEOUT_PROPERTY_KEY = " axis.connection.timeout "; protected void preparePortStub(Stub stub) { super.preparePortStub(stub); stub._setProperty(TIMEOUT_PROPERTY_KEY, new Integer(60)); System.out.println("In the preparePortStub method");
Setting the queryTimeout on JDBC calls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 11 <bean id=&quot;errorDao&quot; parent=&quot;baseDaoProxyParent&quot;> <property name=&quot;target&quot;> <bean class=&quot;com.appl.integration.daoimpl.jdbc.ErrorDaoJdbcImpl&quot; parent=&quot;applBaseDaoJdbcParent&quot;> <property name=&quot;sqlMap&quot; ref=&quot;sqlMap&quot;/> <property name=&quot; queryTimeout&quot; value=“60 &quot;/> <property name=&quot;ignoreWarnings&quot; value=&quot;true&quot; /> </bean> </property> </bean> <bean id=&quot;baseDaoProxyParent&quot; class=&quot;org.springframework.aop.framework.ProxyFactoryBean&quot; abstract=&quot;true&quot;> …
Health Check Procedures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 12
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 13 Alerts Auto Notification
Understanding Native storage usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 14
Memory Leak issue using ThreadLocals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 15
Finding Java Threads outside of WebSphere on z/OS management Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 16 Dump Analyzer can be used to find Threads that are allocated outside of WebSphere Thread pool, as shown in example below -
Reference material ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 17
Questions Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 18 ?

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Achieving High Availability of WebSphere on z/OS through Failover and Timeout Configuration

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  • 7. Sample WebSphere on z/OS Cells configuration (naming convention has been changed to protect our environment) Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 7
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  • 16. Finding Java Threads outside of WebSphere on z/OS management Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 16 Dump Analyzer can be used to find Threads that are allocated outside of WebSphere Thread pool, as shown in example below -
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  • 18. Questions Session 1783 – Part II Achieving High Availability with WebSphere on z/OS - user experience 18 ?