AU 54 HACMP PDF

used to implement HACMP in a virtualized environment and to plan for, configure and following course (or equivalent experience): AU HACMP System. This edition applies to HACMP for AIX and HACMP/Enhanced Scalability ( HACMP/ES), Program. Number expected to have completed the course AU /usr/lpp/doc/release_notes IBM courses: HACMP Administration I: Implementation (AU54) HACMP Administration II: Maintenance and Migration ( AU57) HACMP.

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This article explains how to use the IBM PowerHA SystemMirror feature to get a cluster into stable state in case of any applications hacpm resource failure due to wrong input without stopping cluster services. There are chances, that due to wrong input in resource or applications, cluster might not come to stable state and resource uacmp might go to error state. PowerHA provides feature that allows a cluster to come into stable state and resource wu as per the policy after correcting wrong input without stopping the cluster services.

This article explains resource failure with an application failure under the resource group. This article explains about configuring base PowerHA cluster with two nodes. Similarly more than two nodes cluster can be created along with Site separation based on repository disk.

Recovering from a resource failure in IBM PowerHA cluster

Site based cluster can be stretched cluster or linked cluster, stretched cluster is at same location where as linked cluster is configured where data centers are at different geographical locations. This article describes how to recover from application failure in a cluster using four nodes stretched cluster.

Figure 1 shows a four-node stretched cluster setup. View image at full size. In this cluster, one network and three resource groups are created. RG1 is nonconcurrent resource group and other 2 resource groups are concurrent groups. Cluster is created from SiteANode1 and changes are propagate on all nodes in cluster through verify and sync feature.

The following cltopinfo utility output shows a basic cluster information. Assume that there is an application which is at home directory in server and we need to make that application highly available with PowerHA.

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So there will be an application controller start,stop script, and also monitor script to monitor application in a hacpm. An application will be added to resource group under a volume group and a file system will be created on it. This application is a resource under resource group RG1. This section demonstrates how to add application controller and monitor scripts are added to PowerHA cluster.

Run the smit hacmp command at the command prompt. Figure 2 shows screen hcamp adding application controller scripts. The first field is mandatory as it ask about the controller name.

An application controller name is user defined. Second field is to add start script and third field is to add stop script. Monitor script is not yet added so it wont display.

Monitor script can be added after creating application controller or before application controller also. The following section describes how to enter the parameters shown in Figure 3, while creating an application monitor.

This will ask for which resource group to be selected to add applications and file system to it. Here, applications and file system will be added to resource group RG1. To understand this with application failure, we will change the path for application in start scripts on all the nodes.

AU54 – HACMP System Administration I – Planning and Implementation – 资料 – twt企业IT交流平台

After starting the cluster services, due to wrong input into script it will keep on restarting application controller because of restart count. An application will not be able to stabilize with that wrong path in above mentioned zu. If there is wrong path in script only on one node, resource group will try to come ONLINE on that particular node but after completing 3 restart count it will fall over to next node as per restart count set in Figure 3if next node has everything correct in application then cluster will be stable and resource group will come online on that node.

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Application under that Resource group is also not started. Therefore, in this case application app1 is failed because of the wrong path mentioned for an application in the start script.

So manual intervention is required as per hacmp. After changing the script manually, HACMP will provide feature to recover from failure which will run a clruncmd script under cluster utilities. Run the smit jacmp command at the command prompt and select the following options. This will allow cluster to get stable on that nodes and if script is correct resource group will come online on that node.

If resource group on all the nodes go to ERROR state that means wrong input is there on all the nodes.

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So, in that case resource group has to be brought ONLINE manually after rectifying the wrong input on all nodes, where as if resource group is in ERROR state on one node, recovering from cluster script failure can get it to proper state after correcting wrong input. If a script is failed because of the yacmp input to PowerHA, the Cluster Manager will report failure in hacmp.

User need to manually change the wrong input after seeing error in to hacmp. Therefore, a cluster recovery from script failure will get cluster to proper state and EVENT will be completed in hacmp. This article can help users to get recovery from cluster failure due to failure in a resource or application caused by the wrong hacmo.

Customer can get a cluster to a stable state and a resource group to an accessible state after rectifying the wrong input to their resources. Sign in or register to add and subscribe to comments. Comments Sign in or register to add and subscribe to comments.

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