Networks and network functions
One of the fundamental elements of the SDE approach, software-defined networking allows operators to manage a network programmatically, separating the application that manages the network from the network hardware. This approach provides a flexible, programmable network layer that can be retuned continuously to an organization’s immediate and future needs. The global market for software-defined networking - which includes physical network infrastructure; virtualization and control software; SDN applications, including network and security services; and professional services – was valued at 3.5 billion in 2016. Its growth is apparent in the increase of SDN- and network function virtualization (NFV)- related data center traffic, which is forecast to increase sixfold, from 0.8 zettabytes in 2015 to 5.2 zettabytes in 2020. Meanwhile, the market subsegment of software-defined wide-area networks (SD-WANs) was estimated to reach 250 million U.S. dollars in 2016.
The second element of SDE, software-defined storage, describes an approach through which enterprises can deploy heterogeneous storage hardware without worrying about interoperability. Features of SDS may include virtualization, advanced policy management, and automated data deduplication, replication, snapshots, and backups. Through such features, the need for manual oversight of storage resources is reduced and much of their management can be automated. In surveys around the business goals driving the adoption of SDS, respondents indicated that they wished to future-proof infrastructure, simplify the management of disparate storage classes, and extend the life of existing assets. Other drivers included improving disaster preparedness, reducing costs, and reducing business disruption. In 2016, the software-defined storage market was valued at 4.7 billion U.S. dollars, and was forecast to increase to 22 billion by 2021.
Finally, the software-defined everything trend has culminated, at least for the time being, in the software-defined data center. A SDDC is an IT facility where the infrastructure elements – networking, storage, compute, and security – are virtualized and delivered on-demand, and the operation of the infrastructure is automated, ideally in its entirety, by software. The software-defined data center market was valued at 26 billion U.S. dollars in 2016 and is expected to increase to 83 billion dollars by 2021. One study reported that, on average, 18 percent of IT spending went towards data center operations and infrastructure. If software-defined savings can be realized - whether through hardware savings, reduced power consumption, cooling requirements, or maintenance costs - the impact on budgets may be significant. Coupled with the promised efficiency, scalability, and productivity gains, software-defined everything will have a lasting impact on business operations.