Clustering
There are two types of Web server clustering: failover support and load balancing. A cluster has the appearance of a single server, although possible virtual Web site hosting within the cluster gives the opposite appearance. Thinking about this material can be mind-bending.
Each failover cluster member machine reports its well-being as a heartbeat signal to the other machines. If a machine fails to report, it is taken offline. The other members of the cluster take up its workload. This works because the machines share a disk array on a common SCSI bus. The disk array isn't a potential single point of failure because it is configured in an error-correcting RAID configuration that allows a drive to disappear with no ill effect. A failover ...
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