What Is High Availability and How Do You Design for It?
High availability keeps systems running when parts fail. Here is how redundancy and failover work, what each extra nine of uptime really costs, and how to pick the right target.
Anything as a Service: the broad trend of delivering products, tools, and capabilities over the internet as subscription-based services.
XaaS extends the familiar cloud models, software as a service, platform as a service, and infrastructure as a service, to almost anything. Examples include database as a service, security as a service, desktop as a service, AI models offered through APIs, and even hardware such as devices leased with ongoing support.
For customers, XaaS converts large upfront purchases into ongoing operating expenses and shifts maintenance and upgrades to the provider. It allows organizations to scale up or down quickly and try new capabilities without major investment. For providers, it creates recurring revenue. Downsides include accumulating subscription costs, dependence on vendors, data portability concerns, and the complexity of managing many separate services and contracts.
Delivering computing resources such as servers, storage, databases, and software over the internet on a pay-as-you-go basis.
Platform as a ServiceA cloud model that provides a ready-to-use environment for building, deploying, and running applications without managing servers.
Software as a ServiceA model in which software is hosted in the cloud and delivered to users over the internet, usually through a subscription.
High availability keeps systems running when parts fail. Here is how redundancy and failover work, what each extra nine of uptime really costs, and how to pick the right target.
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