The access layer network infrastructure consists of modular switches, fixed configuration 1 or 2RU switches, and integral blade server switches. The server components consist of 1RU servers, blade servers with integral switches, blade servers with pass-through cabling, clustered servers, and mainframes with OSA adapters. Access layer – Where the servers physically attach to the network.Server-to-server multi-tier traffic flows through the aggregation layer and can use services, such as firewall and server load balancing, to optimize and secure applications. Aggregation layer modules – Provide important functions, such as service module integration, Layer 2 domain definitions, spanning tree processing, and default gateway redundancy. The core layer runs an interior routing protocol, such as OSPF or ISIS, and load balances traffic between the campus core and aggregation layers. The core layer provides connectivity to multiple aggregation modules and provides a resilient Layer 3 routed fabric with no single point of failure. Core layer – Provides the high-speed packet switching backplane for all flows going in and out of the data center.These layers are briefly described as follows: The layers of the data center design are the core, aggregation, and access layers. The layered approach is the basic foundation of the data center design that seeks to improve scalability, performance, flexibility, resiliency, and maintenance. The data center network design is based on a proven layered approach, which has been tested and improved over the past several years in some of the largest data center implementations in the world. Such a design requires solid initial planning and thoughtful consideration in the areas of port density, access layer uplink bandwidth, true server capacity, and oversubscription, to name just a few. Designing a flexible architecture that has the ability to support new applications in a short time frame can result in a significant competitive advantage. Proper planning of the data center infrastructure design is critical, and performance, resiliency, and scalability need to be carefully considered.Īnother important aspect of the data center design is flexibility in quickly deploying and supporting new services. The data center infrastructure is central to the IT architecture, from which all content is sourced or passes through. The data center is home to the computational power, storage, and applications necessary to support an enterprise business. When you consider that 70 percent of network downtime can be attributed to physical layer problems, specifically cabling faults, it’s paramount that more consideration be given to infrastructure design. Faced with these consequences, IT executives today must optimize their data centers, like their Cisco Data Center or others, particularly the network infrastructure. Millions of dollars can be lost in a matter of minutes for businesses like banks, airlines, shipping facilities and online brokerages. When employees and customers are unable to access the servers, storage systems and networking devices that reside in the data center, your entire organization can shut down. As you know, it provides the means for all storage, management and dissemination of data, applications and communications for your business. In this way, we can share our experiences with other users, making this a resource that will benefit the NIH community, its grantees and perhaps many other institutions looking for a one-stop guide to data center facilities.Your data center is the most critical resource within your organization. We invite you to provide us with your suggestions to improve the guide as you proceed with your facilities. We recommend using this guide in all new and retrofit data center facility designs. The NIH Sustainable Data Center Design Guide can assist you with your data center design efforts by providing essential proven cost savings and energy efficient strategies that can expand with your future needs. The review committee included architects, mechanical, electrical, fire protection and environmental engineers, information technology experts and facility managers.
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