We use Dell Servers with the Redhat Enterprise Linux Platform. 

The platform is designed in such a way that if any server fails another server automatically and without delay takes over that server's workload. For example, if a mail servers breaks down another server automatically comes online, with all the correct configuration, and takes over the work of the failed server. During this period no email is lost.

As well as this, all data is stored in two large network disk arrays. Data is automatically synchronised between the arrays so that in the event of an array failing the remaining array continues to serve data to the servers with no downtime.

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