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Clustered Failover Servers
ATSG has deployed server clusters for hosting Microsoft® Exchange Email, BlackBerry® Enterprise Server and Microsoft® Mobility.
A cluster is defined as any two or more servers working together in a coordinated fashion to deliver a common service or set of services. Microsoft® Exchange is a high-performance computing (HPC) application, which lends itself well to deployment on a server cluster.
Since ATSG must keep the enterprise infrastructure constantly working at a consistent, responsive level of performance, especially during reasonable peaks in user load. High-availability clustering was once the exclusive domain of mainframe and minicomputer systems. Now high-availability clusters are an option for most mission-critical business applications running in Microsoft® Exchange email.
High-availability failover clusters are designed to improve system reliability and manageability. We deploy failover clusters to keep end-user applications
operational during both planned system events (such as backups, maintenance, and peak user loads) and unplanned events (such as hardware failures and network
outages). As part of the fault-tolerant design, each critical system component sends a short message, or heartbeat, over the network at regular intervals to indicate
that it is still online. Should a computing or networking component in the
cluster fail to send a heartbeat within the predetermined time, the operating system will direct other servers in the cluster to perform tests that evaluate the health of the
system in question. If a critical component has failed, cluster members will initiate emergency actions to assume the load and resources of the failed node.
ATSG high-availability failover clusters for email are deployed in server pairs (see Figure 1).
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50 employees = savings of $80,000 over 3 years