Downtime
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def
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the unavailability a change process can cause, usually scheduled during non-production hours to minimize disruption
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mitigation
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where possible, switch to a secondary system, upgrade the primary, then switch back — minimizing or fully preventing downtime
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automate the process as much as possible, be ready to switch back to secondary if issues appear (this should be part of the Backout Plan), and communicate the change via email/calendar updates
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