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The concept of a cluster is that the cluster itself appears on the outside as a single system. A cluster consists of two or more Real Computers referred to as nodes or members of a cluster. The components of a cluster are commonly, but not always, connected to each other through fast Local Area Networks.
Clusters are usually deployed to improve performance and/or availability over that provided by a single computer, while typically being much more cost-effective than single computers of comparable speed or availability. Clustering is all about the back-end operations being performed by the nodes or members which appear to the outside world as a single computational entity.
High Performance Clusters (HPC)
Multiple nodes in cluster perform concurrent calculations. There are two key benefits of High
Performance (or grid) computing :
High Availabilty Clusters (HA)
High-availability clusters provide continuous availability of services by eliminating single points of failure and by failing over services from one cluster node to another in case a node becomes inoperative. High-availability clusters are sometimes referred to as failover clusters.
Red Hat Cluster Suite provides high-availability clustering through its High-availability
Service Management component.
Load Balancing Clusters
Load Balancing Clusters operate by having all workload come through one or more load balancing front-ends, which then distribute it to a collection of back end servers. If a node in a load-balancing cluster becomes inoperative, the load balancing software detects the failure and redirects requests to other cluster nodes. Red Hat Cluster Suite provides load- balancing through LVS (Linux Virtual Server).
Storage clusters provide a consistent file system image across servers in a cluster, allowing the servers to simultaneously read and write to a single shared file system. With a cluster-wide file system, a storage cluster eliminates the need for redundant copies of application data and simplifies backup and disaster recovery. Red Hat Cluster Suite provides storage clustering through Red Hat GFS(Global File System).
Configure VSFTPD Chroot