An example might be when a
vendor releases security patches that must be applied quickly to avoid vulnerability.
The schedule is largely driven by others.
??? Unplanned.downtime: Unplanned downtime is associated with unexpected events
such as network, hardware, and software failures. A typical distributed application
usually consists of a Web browser front-end and an application reliant upon servers,
networks, and database. As a problem with any of these components can cause the
application to become unavailable, all components need to be monitored equally.
Many harmful consequences may occur as a result of service downtime. The following set
of instances illustrates the high impact of service downtime.(Gribble, Brewer, Hellerstein,
& Culler, 2000):
??? Downtime.means.down.revenue: When an application that runs a business is brought
down by database failure, the most immediate and obvious cost is the loss of revenue.
Typically, an e-commerce site may suffer losses from $10K to $100K every hour,
depending on the volume of the online sales transactions. Large telesales businesses
like airline reservations, catalog sales, and TV-based home shopping can easily miss
sales opportunities of $100K per hour.
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