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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An application controller name is user defined. Comments Sign in or register 45 add and subscribe to comments. After changing the script manually, HACMP will provide feature to recover from failure which will run a clruncmd script under cluster utilities. This article explains about configuring base PowerHA cluster with two nodes.
Unix Quick Sheets: IBM PowerHA
This article explains how to use the IBM PowerHA SystemMirror feature to get a cluster into stable state in case of any applications or resource failure due to wrong input without stopping cluster services. This article explains resource failure with an application failure under the resource group. This section demonstrates how to add application controller and monitor scripts are added to PowerHA cluster. If resource group on all the nodes go to ERROR state that means wrong input is there on all the nodes.
Monitor script can be added after creating application controller or before application controller also. Similarly more than two nodes cluster can be created along with Site separation based on repository disk.
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.
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.
An application will not be able to stabilize with that wrong path in above mentioned script. Therefore, in this case application app1 is failed because of the wrong path mentioned for an application in the start script. This application is a resource under resource group RG1. RG1 is nonconcurrent resource group and other 2 resource groups are concurrent groups. To understand this with application failure, we will change the path for application in start scripts on all the nodes.
Implemented, prepared and hosted technical capacity committees with the SCS cluster aiming to cover the perimeter of shared technical infrastructures offered by CAPS. Here, applications and file system will be added to resource group RG1.
Au54 Hacmp System Administration I
Monitor script is not yet added so it wont display. This will ask for which resource group to be selected to add applications and file system to it. View image at full size. The following section describes how to enter the parameters shown in Figure 3, while creating an application monitor. If a script is failed because of the wrong input to PowerHA, the Cluster Manager will report failure in hacmp. Deliverables for each business are described in the table below.
Application under that Resource group is also not started. This article describes how to recover from application failure in a cluster using four nodes stretched cluster. The following cltopinfo utility output shows a basic cluster information. The first field is mandatory as it ask about the controller name.
Businesses Deliverables Maturity Date Encryptions Encryption summary document Between 5 and 10 encryptions per month in collaboration with 1 permanent member of the team Assistance to, and reporting on the committees’ technical capacity Adjustment recommendations to adapt production resources by application 1 committee per month alternatively Pseries and HyperV Assistance provided for 5 working days before the committee Summary sent 3 business days after the committee meeting Optimisations Records specifying the proposed optimisations and the expected gains Forecasts Monthly capacity plan Prior to the 15th day of the following month Managed incidents for various clients, implemented performance indicators on the system.
Established a monthly capacity plan. After starting the cluster services, due to wrong input into script it will keep on restarting application controller because of restart count. PowerHA provides feature that allows a cluster to come into stable state and resource active as per the policy after correcting wrong input without stopping the cluster services.
Second field is to add start script and third field is to add stop script. In this cluster, one network and three resource groups are created. Run the smit hacmp command at the command prompt and select the following options.
This article can help users to get recovery from cluster failure due to failure in a resource or application caused by the wrong input.
So there will be an application controller start,stop script, and also monitor script to monitor application in a cluster. There are chances, that due to wrong input in resource or applications, cluster might not come to stable state and resource group might go to error state. User need to manually change the wrong input after seeing error in to hacmp.
Run the smit hacmp command at the command prompt. 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.
Figure 1 shows a four-node stretched cluster setup. Hacmo, a cluster recovery from script failure will get cluster to proper state and EVENT will be completed in hacmp.
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.
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So manual intervention is required as per hacmp. Sign in or register to add and subscribe to comments. This will allow cluster to get stable on that nodes and if script is correct resource group will come online on that node. Cluster is created from SiteANode1 and changes are propagate on all nodes in cluster through verify and sync feature. Figure 2 shows screen for adding application controller scripts.
Assume that there is an application which is at home directory in server and we need to make that application highly available with PowerHA. An application will be added to resource hcmp under a volume group and a file system will be created on it.