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A clustered system uses multiple CPUs to accomplish a task. It is different from pal system in that clustered system consists of or more individual systems coupled Rogether. The clustered computers share storage and are closely linked via LAN networking
on the failed The clustering is usually performed to provide high availability. A layer of cluster running software runs on cluster nodes. real time health systems
Each node can monitor one or more nodes over the LAN. The mentored machine can fail in some cases. The monitoring machine can take ownership of its storage. The monitoring machine can also restart applications that were machine. The failed machine can remain down but the users will see a brief of the service.
- realtime health systems
- cluster computing
- high availability cluster
Asametric Clustering
In this form, one machine is in hot standby mode and machine runs the application. The hot stand by machine performs nothing. It only monitors the server. It becomes be active server the server fails
Symmetric Clustering
in this form, two or more machines run the applications. They monitor each other at the same time. This mode is more efficient because it uses all available machines. It can be used by multiple applications are available to be executed.
Some other forms of clusters are parallel clusters and clustering over WAN P clusters allow multiple hosts to access the same data on a shared storage. Most operations do not provide the support for simultaneous data access by multiple hosts That why parallel clusters are usually accomplished by special versions of software
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