A fault-tolerant system is one that is prepared to continue operating in the event of key component failures. This technique is very useful for servers running critical applications. Here are a few of the many ways to ensure fault tolerance in a system:
• Use one or more RAID arrays for system and data storage, protecting you from hard-disk failure. If a hard disk in the array fails, only that disk needs to be replacedand no data is lost. See Chapter 6, "Disk Management," for information about using Windows Small Business Server 2003 to implement software RAID.
• Use multiple SCSI adapters to provide redundancy if a SCSI controller fails.
• Use an uninterruptible power supply (UPS) to allow the server to shut down gracefully in the event of a power failure.
• Use multiples of everything that is likely to fail, including power supplies.
• Buy hardware that is listed in the Windows Server Catalog at: http://www.microsoft.com/windows/catalog/server/
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