109 lines
7.2 KiB
HTML
109 lines
7.2 KiB
HTML
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<meta name="DC.Title" content="Job structure and user queues" />
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<meta name="abstract" content="When managing cluster, you need to know about job structures and user queues." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsfailovermessagequeue.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigmanagemaintainuserprofiles.htm" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Job structure and user queues</title>
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</head>
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<body id="rzaigmanagejobstructure"><a name="rzaigmanagejobstructure"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Job structure and user queues</h1>
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<div><p>When managing cluster, you need to know about job structures and
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user queues.</p>
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<div class="section"><h4 class="sectiontitle">Cluster resource services job structure</h4><p>Cluster
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resource services consists of a set of multi-threaded jobs. When clustering
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is active on a server, the following jobs run in the QSYSWRK subsystem under
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the QSYS user profile. The jobs run using the QDFTSVR job description, but
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with the logging level set such that a job log will be produced.</p>
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<ul><li>Cluster control consists of one job that is named QCSTCTL.</li>
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<li>Cluster resource group manager consists of one job that is named QCSTCRGM.</li>
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<li><img src="./delta.gif" alt="Start of change" />Cluster resource groups consist of one job per cluster
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resource group object. The job name is the same as the cluster resource group
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name. This includes the cluster administrative domain.<img src="./deltaend.gif" alt="End of change" /></li>
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<li>When one or more device list entries in a resilient device CRG have been
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set to be brought online at switchover or failover, additional jobs will be
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submitted to perform the vary on function.</li>
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</ul>
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<p>The QCSTCTL and QCSTCRGM job are cluster critical jobs. That is, the
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jobs must be running in order for the node to be active in the cluster.</p>
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<p>Most
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cluster resource group APIs result in a separate job being submitted that
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use the user profile specified when the cluster resource group was created.
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The exit program defined in the cluster resource group is called in the submitted
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job. By default, the jobs are submitted to the QBATCH job queue. Generally,
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this job queue is used for production batch jobs and will delay or prevent
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completion of the exit programs. To allow the APIs to run effectively, create
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a separate user profile, job description, and job queue for use by cluster
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resource groups. Specify the new user profile for all cluster resource groups
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that you create. The same program is processed on all nodes within the recovery
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domain that is defined for the cluster resource group. </p>
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<p><img src="./delta.gif" alt="Start of change" />You
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can use the <a href="../cl/chgclurcy.htm">Change
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Cluster Recovery (CHGCLURCY) command</a> to restart the cluster resource
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group job that ended without ending and restarting clustering on a node. <img src="./deltaend.gif" alt="End of change" /></p>
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</div>
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<div class="section"><h4 class="sectiontitle">Cluster APIs use of user queues</h4><p><img src="./delta.gif" alt="Start of change" />Functions
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performed by an API that has a results information parameter operate asynchronously
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and send their results to a user queue once the API is finished processing.
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The user queue must be created before calling the API. You can create a user
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queue by using the <a href="../apis/quscrtuq.htm"><span class="apiname">Create
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User Queue (QUSCRTUQ)</span> API</a>. The queue must be created as a
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keyed queue. The key for the user queue is described in the format of the
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user queue entry. The user queue name is passed to the API. The Cluster API
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documentation contains <a href="../apis/clust1a4.htm">examples</a> on
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how to use user queues with Cluster APIs.<img src="./deltaend.gif" alt="End of change" /></p>
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<p>When the <a href="../apis/cldistinfo.htm"><span class="apiname">Distribute Information
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(QcstDistributeInformation)</span></a> API is used, the information
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sent between nodes is deposited on the user queue specified when the CRG was
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created. This queue must be created by the user on all active nodes in the
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recovery domain before useing the <span class="apiname">Distribute Information</span> API.
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See the <a href="../apis/clrgcrtcrg.htm">Create
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Cluster Resource Group (QcstCreateClusterResourceGroup) API </a> for details
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on when the distribute information queue must exist. </p>
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<p>The failover message
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queue receives messages regarding failover activity.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzaigconceptsfailovermessagequeue.htm">Failover message queue</a></strong><br />
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The failover message queue receives messages regarding failover activity.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigmanage.htm" title="This topic contains information that covers some of the tasks that involve managing your clusters.">Manage clusters</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaigmanagemaintainuserprofiles.htm" title="You can use two mechanisms for maintaining user profiles on all nodes within a cluster.">Maintain user profiles on all nodes</a></div>
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<div><a href="rzaigtroubleshootdetermineproblem.htm" title="Start here to diagnose your cluster problems.">Determine if a cluster problem exists</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaigtroubleshootrecoverjobfailure.htm" title="Failure of a cluster resource services job is usually indicative of some other problem.">Recover from cluster job failures</a></div>
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</div>
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</div>
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</body>
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</html>
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