1 I D C M A R K E T S P O T L I G H T E t h e r n e t F a brics: The Foundation of D a t a c e n t e r Netw o r k Au t o m a t i o n a n d B u s i n e s s Ag i l i t y January 2014 Adapted from Worldwide Datacenter Network Forecast and Analysis by Brad Casemore, Rohit Mehra, Petr Jirovsky, IDC # Sponsored by Brocade Networks The datacenter has experienced considerable dynamism and innovation in the past few years as a result of virtualization, cloud computing, enterprise mobility, Big Data, and social media. At the same time to meet the real-time needs of the business and to satisfy the increasing demands and expectations of the business and end users IT is being challenged to transform itself from a technology provider into a responsive, cost-efficient service-based organization. Toward that end, IT has embraced server virtualization and cloud computing for their capacity to improve IT agility through inherent automation and efficiency, but the datacenter network has gone largely ignored. Virtual machines (VMs) or cloud services, for example, can be spun up in mere minutes to support new application workloads, but configuring the network requires significant time and effort, impeding the agile delivery of services. In response, new datacenter network architectures and technologies have emerged, including Ethernet fabrics. This Market Spotlight considers how a datacenter network fabric can provide a foundation for the automated provisioning, configuration, and ongoing management of network-based services in the era of virtualization, cloud, and agile IT computing. The Impetus for Datacenter Automation Datacenter automation can deliver numerous benefits, including increased operational efficiency, business agility, faster time to opportunity and time to value, and lower operational expenditures. Various IT constituencies application, compute/virtualization, storage have invested in automation tools and technologies to achieve those results, and now networking professionals are joining their counterparts in realizing the value that automation can deliver. Since 2012, IDC research has found that the shift to private and public cloud caused many enterprises to view automation as a key element of success, both as an enabler and as a means of achieving considerable savings in operational expenditures. IDC also has found that cloud-oriented enterprises are working diligently to better align their network infrastructure with the ever-increasing demands of the business and the changing traffic patterns within datacenters. As businesses strive for enhanced agility and the ability to roll out new services and applications in real time, the highly manual, labor-intensive nature of legacy network operations has become more pronounced, delaying the deployment of new services sometimes days or weeks. Additionally, traffic patterns in the datacenter are shifting. The north-south traffic found in client/server environments is being supplanted by east-west (or server-to-server) traffic driven by new applications architectures and virtualization. Legacy network designs optimized for north-south traffic are highly inefficient and difficult to scale without significant disruption or delay. These factors have led to a new network architecture Ethernet fabric designed specifically to support the automation, efficiency, and agility requirements created for a virtualized cloud environment. IDC 1636
2 Key Trends Impacting Datacenter Network Automation The following industry and technology trends have converged to drive a compelling need for datacenter network automation: Growth of new and existing application workloads, physical and virtual. Enterprise IT teams must support not only traditional workloads, many of which will remain on physical servers, but also a growing percentage of virtualized applications, a trend being accelerated by the transition to private and public cloud computing. In a survey of server virtualization, IDC found that during the next several years, virtual machine (VM) deployment will be robust, whereas physical server deployment will be modest. Moreover, by 2015, VMs will have grown by a factor of 10 (see Figure 1). F i g u r e 1 Growth in Server Virtualization Deployments 10x Growth in VMs Rapid rise in VMs and mobility is forcing customers to rethink infrastructure requirements Source: IDC's Server Virtualization Multiclient Study, January 2012 This rapid and sustained growth in VMs and VM mobility is forcing a significant reassessment of IT infrastructure. The network must become flatter and more responsive to the needs of burgeoning east-west traffic volumes which flow within, between, and among servers that have overwhelmed traditional three-tier switching architectures and limited scalability. In this regard, fabric-based approaches to multipathing, optimized for east-west traffic, minimize latency, improve network efficiency, and facilitate VM mobility IDC
3 The rise of software-defined networking (SDN) and network virtualization in response to the need for agile approaches to network infrastructure. Initially deployed in hyperscale datacenter environments, SDN has arisen as an arguably belated response from the network infrastructure to the increasingly urgent requirements of virtualized applications, evolving traffic patterns, and infrastructure agility. Whether exemplified by OpenFlow-based SDN or by SDN overlays for network virtualization, this development is all about injecting the network with the agility, flexibility, responsiveness, and visibility required to support the needs of the nextgeneration datacenter. While these technologies are just now emerging, the right network fabric provides a bedrock foundation for SDN-ready infrastructure. Focus on agility and automation in other datacenter discipline (compute/virtualization, storage, etc.). Virtualization of compute and storage necessitated increased automation as a means of adapting the changes and achieving simpler, more effective management models. Similarly, as network infrastructure, after a long period of comparative modest innovation, finally rises to the challenge of virtualization in the datacenter, it is providing not only new fabrics and architectural models but also a more automated approach to provisioning, orchestration, and management. Datacenter Network Automation Challenges and Key Considerations As IT professionals acknowledge the need for automation throughout the datacenter, including the network, they have to consider several factors. One critical factor involves how the network infrastructure can become more agile and flexible to accommodate the unique requirements of virtualization and cloud. The path to operational agility is paved with automation. Manual processes will not scale, and they cannot meet the new operational needs, in terms of both agility and flexibility, that increasingly virtualized workloads and business requirements demand. The workload-driven need for faster provisioning and deployment is acutely felt by IT departments, especially those embracing cloud computing. Only through automation can IT departments reduce their provisioning times from weeks to minutes. The result, of course, is faster application or technology time to value and improved utilization of staff and resources. As customers contemplate how to evolve their datacenter network to support higher levels of automation and better alignment with other datacenter IT resources, they should consider the following: Time to provision new network devices. Enterprise IT departments should consider solutions that minimize deployment time through mechanisms such as zero-touch provisioning. Manual switch configuration for Spanning Tree Protocol (STP), link aggregation groups (LAGs), quality of service (QoS), etc., which consume valuable time and personnel resources, should no longer be tolerated. Ongoing management and operations. Enterprises should consider solutions that allow them to manage multiple switches or an enterprise fabric as one logical switch. This provides a single point of management for fabricwide configuration, software maintenance, and troubleshooting, significantly reducing operation time and costs. It also delivers a simplified architecture with a single IP interface for interconnecting with higher-level orchestration, thus offering greater scalability and IT agility IDC 3
4 Alignment with other IT resources: VM intelligence. The network should be VM aware to ensure proper alignment between applications and relevant network services. When a new VM is created, it should be automatically detected by the fabric, and appropriate network policies should be applied. Moreover, as a VM moves from one server to another, the network policies associated with the application should dynamically and transparently move with it. IP storage awareness. IT departments should be able to automatically provision QoS for IP storage traffic, thereby eliminating the complexity and operational overhead traditionally associated with configuring QoS. Typically, this challenge has been addressed through network overprovisioning, which basically sidestepped the question of QoS entirely. Application service availability. When network nodes are added to or removed from service, the fabric should automatically form and reform without causing service disruption to key application workloads. Orchestration. In addition to an optimized physical infrastructure designed to support new workloads and increased service deployment velocity, customers migrating to cloud models are considering new orchestration frameworks such as OpenStack to automate the provisioning of compute, storage, and network resources and to improve ongoing monitoring and management eliminating the IT bottleneck. As customers evaluate nextgeneration datacenter networking solutions, they should also ensure that the solutions offer open APIs to enable integration with current and future orchestration resources. Conclusion Increasing business agility demands and application workloads, as well as new types of workloads and associated traffic patterns, have placed new stresses on datacenter infrastructure and operations. While server and storage teams adapted relatively quickly to virtualized workloads and trends such as mobility and cloud, the datacenter network was slower to adjust. The network only now is embracing new architectures, operational models, and technologies such as Ethernet fabrics that can help it better align with the application and service requirements of the next-generation datacenter. The benefits of having the right architectural approach to automating the datacenter network are clear: Increased operational efficiency Improved business agility Faster time to opportunity (and time to value) Better resource utilization (of infrastructure and staff) All of these benefits can result in reduced operational expenditures. Nevertheless, despite industry trends that bolster the case for increased automation of the datacenter network, a number of key considerations should be carefully addressed. In the final analysis, an adaptable and robust network fabric, combined with an automation strategy that expedites and simplifies network provisioning and configuration, provides a solid foundation for datacenter agility in the cloud era IDC
5 A B O U T T H I S P U B L I C A T I O N This publication was produced by IDC Custom Solutions. The opinion, analysis, and research results presented herein are drawn from more detailed research and analysis independently conducted and published by IDC, unless specific vendor sponsorship is noted. IDC Custom Solutions makes IDC content available in a wide range of formats for distribution by various companies. A license to distribute IDC content does not imply endorsement of or opinion about the licensee. C O P Y R I G H T A N D R E S T R I C T I O N S Any IDC information or reference to IDC that is to be used in advertising, press releases, or promotional materials requires prior written approval from IDC. For permission requests, contact the Custom Solutions information line at or Translation and/or localization of this document requires an additional license from IDC. For more information on IDC, visit For more information on IDC Custom Solutions, visit Global Headquarters: 5 Speen Street Framingham, MA USA P F IDC 5
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