1.5.2 Different causes of system outage

Ideally, system outage should occur only in a planned way during a service window in which you will not impact your users or your revenue generation. However, it is possible that an outage may happen when it is not expected. You should have a High Availability solution that can tolerate system outages, but, at the same time, you should ensure that you have an established process, as a last resort, for when that is not possible. For example, who will handle what aspect of the system outage and how the communications will be sent and so on?

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