Calculate the unavailability of the following system. The load balancer switches cleanly between the presentation server and its backup. The presentation server uses the main database but can fail over to the database backup. The backup presentation server is only configured to use the main database, not its backup. Assume the following unavailabilities. Item Unavailability LoadBalancer 0.9% PresentationServer 0.9% PresentationServerBackup 0.7% Database 1.1% DatabaseBackup 0.6%

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.