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PowerHA for AIX is the new name for HACMP (High Availability Cluster Multiprocessing). HACMP is an application HACMP Basics. History IBM’s HACMP exists for almost 15 years. It’s not actually an IBM product, they ou!ht it from C”AM, #hich #as later renamed to. A$ailant. HACMP basics. HACMP Cluster can be managed by 1) Smit 2) WebSMIT. Config tasks. Configure Cluster Topology; Then HACMP Resources.

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Not only does it provide for load balancing, it also delivers high availability through redundancy of applications and data. This model would best be applied to scientific and technical tasks, such as computing artificial intelligence data.

One port on such an adapter should not be used to back up another port on that adapter, since the adapter card itself is a common point of failure. By gathering heartbeat information on multiple nodes, HACMP can determine what type of failure has occurred and initiate the appropriate recovery action.

POWERHA/HACMP: Basic commands – syscookbook

See Figure 2 below. Application Data Location Where should application binaries and configuration data reside? Data resilience ensures that a copy of the data is always accessible to end users of the cluster.

These last steps need to be repeated for the different adapters to be assigned to the various networks for HACMP purposes. Once the Filesystem is created, try mounting the file system. What is your job function? Each of these computers is processing digitized “noise” from outer space in a feverish search to answer the question, “Is anyone out there?

PowerHA handles this as a single unit. You should provide protection from power losses through an external uninterruptible power supply UPS or equivalent. Perform similar operations on node2. It is through this IP only that the end users will connect to the application. Before starting off with the configurations, let’s look at the networking and the storage considerations of PowerHA.

This is particularly useful for applications which are installed locally. When done properly, this provides the highest level of availability against adapter failure. Be sure to terminate any child or spawned processes that may be using the disk resources. There should be plenty of details on any errors and passes, too.


Load balancing can be implemented with hardware, software, or a combination of both, and is a highly attractive reason to choose a clustering solution. 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.

Relying on a failure of a node to stop an application will be effective, but to use some of the more advanced features of HACMP the requirement exists to stop an application cleanly. Similarly, every other point of failure that can interrupt availability must be eliminated. The following table shows possible SPOFs:.

Disk heartbeat networks only require a small disk or LUN. Design the interconnecting nodes. IBM is also demonstrating its committment to their Linux customers who bbasics affordable open source high-availability solutions by partnering with the Linux community in the Linux-HA project.

Hence, service IP should be kept highly available.

Open 2 different sessions of both the nodes. Both must be accessible across the cluster even when the normal hosting system for the resource fails. Cluster Components Here are the recommended practices for important cluster components. This will check the status and configuration of the local node first, and then it will propagate the configuration to the other nodes in the cluster, if they are reachable.

Introduction to PowerHA

HACMP networks not only provide client access to hacnp applications but are used to detect and diagnose node, network and adapter failures. Determine what data to replicate. See Figure 8 below. Massively parallel processing MPP systems can also provide parallel processing capability, and truly excel when used in environments that involve many separate, independent operations on large quantities of data, such as data mining and artificial intelligence tasks.

Be aware of network detection settings for the cluster and consider tuning these values. This model easily scales up as the overall volume of users and transactions goes up. Figure 2 shows that the heartbeat packets are transferred and received by all NICs, which helps in determining bxsics failures. To do that, run the following command:. If the application is packaged in LPP format, it hcmp usually installed on the local file systems in rootvg.


For storage, a redundant array of independent disks RAID is one approach. For example, if you basicd running a business on the Web, your critical data may include: Please choose a display name between characters.

UNIX SYSTEM ADMINISTRATION : hacmp basic concept

With mutual takeover, every system or node is used for production work, and all critical production work is accessible from multiple systems, multiple nodes, or a cluster. Formalized service levels within corporations and between businesses are becoming standard practice. Data transaction servers manage core business processes. There are many reasons this is an attractive thing to do, even for smaller enterprises.

QuinStreet does not include all companies or all types of products available in the marketplace. For high availability to be achieved, the application must have the ability to stop and start cleanly and not explicitly prompt for interactive input. Additionally, however, this consolidation model offers the benefit of delivering high quality of service resources in a cost effective manner. A more recent approach is the storage area network SAN. In this environment, the clustering technology must be able to allocate and deallocate computing resources e.

Clustering: A basic 101 tutorial

You’ll also bssics to determine what type of communications media is compatible with clustering. Additionally, a Web-based business environment also means that enterprises can no longer expect a single, gigantic “computer in the sky” to solve all its processing needs — even though a server can probably be purchased to handle a company’s total “volumes” in regard to data storage, etc.

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