Fault Tolerance Errors in Network Term Paper

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In server mirroring method, two servers are used for the same purpose while in disk duplexing, two disk operators are used instead of one.

Some important available products for fault tolerance include:

Ethernet's complete fault tolerant system. This is called Telemecanique® Connexium (TM) IP67 Ethernet switch. Along with this Ethernet also offers a wide range of products to make the system more resilient. A website indicates: "The Connexium family of Ethernet industrial hubs, switches, bridges and transceivers enable a complete Ethernet solution that supports a high level of resilience. Their scalable redundant features-from single to double-ring structures-make it easy to build fault-tolerant networks that fit specific environments."

NEC Fault tolerance server provides solution in a single box. These are two servers designed to provide non-stop power supply in order to protect data and avert potential risks to businesses in case of power failure. The two products available by NEC are the NEC Express5800/320Lb Fault Tolerant Servers, and the NEC Disaster Recovery solution. Novell similarly offers a large variety of fault tolerance solution including the SFT series, MTO and stand-by servers.

Windows is not far behind in this field. Windows Servers series is publicized as the most cost efficient fault tolerance solutions. Defining fault tolerant servers offered by Windows, the company states that these servers are those that provide redundancy across all hardware components.

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This means that if one component fails to work, the secondary component would take over without any time loss. Some of the enhanced features of Windows Server 2003 include:

Memory mirroring

Multipath I/O

Improvements in load balancing and failover for miniport drivers

Hot-plug PCI support

Hot-add memory support

Found in Windows released document: Ftstrategies.doc)

While fault tolerance systems are needed in order to avoid potential loss of data and revenues, there are some drawbacks attached to their implementation. The most serious concern is that of costs incurred on these systems. Calculating the monetary costs is not a problem. Most of the firms would be incurring costs on additional servers, hard disks or disk controllers. But the more difficult task is to calculate just how these costs could be justified in the long run.

There are some specific worksheets available to calculate the costs and do a risk analysis. This helps in identifying the need for fault tolerance systems as well as determining if such an installation is required considering company's revenues and loss of revenues from network downtime......

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