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From its inception, the IBM eServer iSeries system has been designed to run applications in support of core business processes. Features of the operating system and hardware have been designed to avoid unscheduled downtime whenever possible and to provide the ability to quickly restore the system to an operational state should a failure occur.
Today, iSeries systems are recognized as one of the most reliable and available servers in the marketplace. However, many companies are finding that even scheduled maintenance and the risk of unforeseen outages are unacceptable. This can be especially true in Web environments where you could have users or customers at any hour of the day. To reach this nearly continuous availability, eventually some type of clustering solution is required.
