Planned outage

A planned outage can be either a complete or a partial outage. It is possible that some businesses may accept lower capacity and performance of their systems during planned outage, say, during off-peak seasons, days, or hours. In such cases the planned, partial outages are much more palatable even though they may last longer than complete planned outage. Such planned, partial outages may not drop the service availability by deploying switchover of services from one component (for example, one server) to another. A switchover can be considered as a safe, deliberate failover. WebSphere Application Server provides rolling upgrade functionality that employs this scheme. For more information about rollout upgrades refer to Part 7, Maintenance.

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