Planning
A planned outage is the result of a planned activity by the system owner and/or by a service provider. These outages, often scheduled during the maintenance window, can be used to perform tasks including the following:
- Deferred maintenance, e.g., a deferred hardware repair or a deferred restart to clean up a garbled memory
- Diagnostics to isolate a detected fault
- Hardware fault repair
- Fixing an error or omission in a configuration database or omission in a recent configuration database change
- Fixing an error in application database or an error in a recent application database change
- Software patching/software updates to fix a software fault.
Outages can also be planned as a result of a predictable natural event, such as Sun outage.
Maintenance downtimes have to be carefully scheduled in industries that rely on computer systems. In many cases, system-wide downtimes can be averted using what is called a "rolling upgrade" - the process of incrementally taking down parts of the system for upgrade, without affecting the overall functionality.
Read more about this topic: Downtime
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