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data center bridging : ウィキペディア英語版
data center bridging

Data center bridging (DCB) refers to a set of enhancements to Ethernet local area networks for use in data center environments, in particular for use with clustering and storage area networks.
==The problem==
Ethernet is the primary network protocol in data centers for computer-to-computer communications. However, Ethernet is designed to be a best-effort network that may experience packet loss when the network or devices are busy.
In Internet Protocol networks, transport reliability under the end-to-end principle is the responsibility of the transport protocols, such as the Transmission Control Protocol (TCP). One area of evolution for Ethernet is to add extensions to the existing protocol suite to provide reliability without requiring the complexity of TCP. With the move to 10 Gbit/s and faster transmission rates, there is also a desire for finer granularity in control of bandwidth allocation and to ensure it is used more effectively. These enhancements are particularly important to make Ethernet a more viable transport for storage and server cluster traffic. A primary motivation is the sensitivity of Fibre Channel over Ethernet to frame loss. The higher level goal is to use a single set of Ethernet physical devices or adapters for computers to talk to a Storage Area Network, Local Area network and InfiniBand fabric.〔Silvano Gai, ''Data Center Networks and Fibre Channel over Ethernet (FCoE)'' (Nuova Systems, 2008)〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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