Hardware infrastructure, providing 32 or 64 bit word capability.
The above list is never exhaustive, but just the main and evident layers.
The availability of any application depends on the ability of the deployment
environment to recover from a failure with a minimum amount of downtime
without any data corruption. Software and hardware are prone to failure, but that is
no reason to show back "Application not available" messages to the end user through
the browser. Such a scenario will create unsatisfied customers who might migrate to
a competitor's service. We all agree that retaining an existing customer is as (or more)
important than gaining a new customer.
One way to address software and hardware failure is to leverage the
industry-leading clustering solutions to deliver best-in-class high availability,
manageability, and performance for applications in enterprise and application
service grid environments. If we don't want to go for such third-party clustering
services, we can also see whether our own chosen application infrastructure (such
as ServiceMix) will provide its own clustering features.
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