As we saw in the first post of the series on cloud terms, as this technology advances, the jumble of terms and acronyms that are difficult to understand is growing. To help you understand them, I bring you the second part of the glossary with the most relevant definitions.
Cloud terms glossary
- Multicloud: A cloud deployment model in which services from multiple cloud providers are combined to take advantage of the specific benefits of each provider.
- On-demand: Equivalent to “on-demand”. In the technology field, it is used to express the flexibility of cloud products, based on a pay-per-use model in which the provider makes all its resources available to the customer on demand so that the customer can respond to peaks and troughs in demand.
- On-premises: This is the traditional licensing scheme, i.e. the company acquires the licences that grant it the right to use the provider’s systems, integrates them into its own installations and maintains its data within its own infrastructure.
- Open Source: Free software should not be confused with freeware because free software does not have to be free. The source code of Open Source is “Open Source” and programs licensed under the GPL (“General Public License”), once acquired, can be freely used, copied, modified and redistributed.
- PaaS or Platform as a Service is a cloud computing service model that provides a ready-to-use development environment over the Internet in which developers can develop, manage, distribute and test their software applications.
- PUE: Power Usage Effectiveness is the value that results from dividing the total amount of energy used by a data centre facility by the energy supplied to the data centre’s IT equipment. Items such as lighting or cooling fall into the category of energy used by a data centre facility. The closer the PUE value is to 1, the more efficient the data centre is.
- Disaster Recovery: or Disaster Recovery is a method of recovering data and functionality after a system outage due to a disaster, natural or human-induceds.
- SaaS or Software as a Service is a cloud computing service model that consists of distributing software applications hosted in the cloud to users via the Internet through a subscription or purchase payment model, while maintaining the privacy of their data and the personalisation of the application.
- Bare-metal server: A bare-metal server is a physical server with a single tenant, i.e. for the exclusive use of the client that contracts it and which is not shared with other organisations or users.
- SLA: Service Level Agreement. This is a protocol, usually set out in a legal document, whereby a company that provides a service to another company undertakes to do so under certain service conditions.
- Oversubscription. Oversubscription of resources occurs when a shared hosting or Public Cloud provider offers a number of computing resources in excess of the available capacity, on the theory that customers do not use 100% of the resources offered.
- VPN: AVirtual Private Networkis a network that creates a private, encrypted and secure connection between two points over the Internet. VPN communication tunnels allow encrypted and secure traffic to be sent and allow company employees to access the information they need from their company, even if it is private.
And because a picture is worth a thousand words, this cartoon amusingly explains the difference between on-premise, IaaS, PaaS and SaaS and the different business resource implications of each model.