Just curious after a recent chat with a colleague and a customer.
We (a business application vendor where the hardware and OS is always managed by the customer) have always rather loosely defined downtime as an unscheduled system wide outage. Which in hindsight makes it easy to claim a 99.99...% uptime.
Some of the points of the chat were that should we be considering planned outages for application hotfixes and configuration changes as downtime.
What would you guys n gals consider as downtime?