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They can be classified into topology components and resource components. The topology components are basically the physical components. They include: Nodes: System p servers can be standalone partitions or vios clients Networks: IP networks and non-IP networks Communication interfaces: Token ring or Ethernet adapters Communication devices: RS or heartbeat over disk The resources components are the logical entities that will be made highly available.
This IP address is mapped to a node where the application is actually running. Since the IP address needs to remain highly available, it is a part of the resource group. File system: Many applications require the file systems to mounted. Volume group: Volume groups are required to be made highly available with many applications.
All the resources together form an entity called a resource group. PowerHA handles this as a single unit. It keeps the resource groups highly available. Resource groups have policies associated with it. Those are: Startup policy: This tells which node the resource group should activate Fallover policy: When a failure happens, this determines the fallover target node Fallback policy: This tells whether or not the resource group will fallback.
Whenever a failure happens, it looks for these policies and works accordingly. The subsystems of PowerHA Figure 2. Subsystems of PowerHA The illustration above shows how PowerHA comprises of a number of software components: The cluster manager clstrmgr is the core process that monitors cluster membership.
The cluster manager includes a topology manager to manage the topology components, a resource manager to manage resource groups, an event manager with event scripts that works through the RMC facility, and RSCT to react to failures. The clinfo process provides an API for communicating between cluster manager and your application. Clinfo also provides remote monitoring capabilities and can run a script in response to a status change in the cluster.
Networking PowerHA uses networks to detect and diagnose failures, as well as providing clients with highly available access to applications. Internode communication also happens through networks. PowerHA detects three kinds of failures directly. Those are the network, NIC and node failure. It detects and diagnosis through the use of RSCT daemon.
RSCT detects the loss of heartbeat packets that are sent across all the networks and determines the exact loss network, NIC or node failure. Figure 2 shows that the heartbeat packets are transferred and received by all NICs, which helps in determining the failures. Figure 3. Cluster representing heartbeat packets If the heartbeat packets are stopped, then both nodes assume that the other is down and each will try to bring the resource group online.
This could result in massive data corruption. To ensure this, we include this service IP into the resource group. Configuration Before starting with the configuration, the cluster must be properly planned. The online planning worksheets OLPW can be used for the planning purpose. Here, it explains the configuration of a two node cluster. In the example provided, both nodes have 3 Ethernet adapters and 2 shared disks.
Step 1: Fileset installation After installing AIX, the first step is to install the required filesets. Install the following filesets: RSCT filesets. Currently, it is called "System P". Currently, the latest release of AIX is version 6.
Cluster Multi-Processing: Multiple applications running on the same nodes with shared or concurrent access to the data.
A high availability solution based on HACMP provides automated failure detection, diagnosis, application recovery and node reintegration. My home My profile My communities Settings. Sign in or register to add and subscribe to comments. Application server is one such resource which needs to be kept highly available, for example a DB2 server.
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El poder de la estupidez
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HACMP BASICS PDF
VIAF ID: 22381991 (Personal)
ISBN 13: 9788408003786