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Cluster computing is a technique of computing in which two or more computers are linked together into a network to take the advantage of parallel processing power of those computers. The cluster components are commonly connected to each other through fast local area networks. Cluster computing can be used for high availability as well as low balancing.

There are a number of reasons why people use cluster computers for computing tasks. It has many advantages to makes people to use it which are as follows:

Easy to deploy

The cluster computing system is very easy to deploy. In this system software is installed as well as configured automatically. Using web interface, the cluster nodes can be easily added and managed and hence, reduces efforts and saves time.

A virtual cluster is a  technology for promising to reducing management costs and improving capacity function in datacenters and PC centers. ontemporary cluster virtualization systems don't have the maximum scalability and adaptability needed, due to limited hardware resources at one site. we are now developing a sophisticated cluster management system for multi-site virtual clusters ; which supplies a virtual cluster composed from distributed PC resources over wide area networks.

This system has great edges over other cluster management systems designed only for single-site resources ; users can create a cluster of virtual machines from local and remote physical clusters in a scalable demeanour, and dynamically change the amount of cluster nodes on demand, elegantly. View of cluster nodes to enable existing applications to be utilized quickly and managed flexibly, just as in physical clusters.

Clustering services became increasingly necessary for organizations employing business-critical e-commerce and line-of-business applications. A cluster is a grouping of PCs collaborating to run a typical set of applications and to show a unified system to the customer and application.

The PCs are physically connected by wires and programmatically connected by cluster software. These connections permit PCs to use failover and load balancing, which isn't possible with a stand-alone PC.

As an example, these notes describe an installation with 4 slave nodes that have 200mhz Pentium MMX processors, and one master with a 166mhz Pentium cpu. All nodes have 32meg of RAM and a Tbase10 network interface, with a second NIC added to the master node. The slave nodes each have a 1G IDE hard disk, while the master node has a 6G IDE hard disk. PVM is installed on all the nodes under / usr / local / pvm3. For PVM applications to work, the source catalog and application executables must be available on all nodes employing the same trail. Because of this, home directories are placed in a new file system on the master node ( / home in this example ) which is exported to all the other nodes.