Analysis and amendment of flow control credit-based in SAN extension

Leihua Qin; Shengsheng Yu; Jingli Zhou

doi:10.1117/12.634330

5 December 2005 Analysis and amendment of flow control credit-based in SAN extension

Leihua Qin, Shengsheng Yu, Jingli Zhou

Proceedings Volume 6022, Network Architectures, Management, and Applications III; 602237 (2005) https://doi.org/10.1117/12.634330
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

As organizations increasingly face an enormous influx of data that must be stored, protected, backed up and replicated. One of the best ways to achieve the goal is to interconnect geographically dispersed SANs through reliable and high-speed links. In this storage extension application, flow control deals with the problem where a device receives the frames faster than it can process them, when this happens, the result is that the device is forced to drop some of the frames. The FC flow control protocol is a credit-based mechanism and usually used for SAN extension over WDM and over SONET/SDH. With FC flow control, when a source storage device intends to send data to a target storage device, the initiating storage device must receive credits from target device. For every credit the initiating device obtains, it is permitted to transmit a FC frame, so congestion is always avoided in the network. This paper analysis the mechanisms of FC flow control and it's limitation in SAN extension when the extension distance increases. Computing result indicates that the maximum link efficiency and throughput in SAN extension have relation to credits, frame size and extension distance. In order to achieve the maximum link efficiency and throughput, an extended FC flow control mechanisms are proposed.

Citation Download Citation

Leihua Qin, Shengsheng Yu, and Jingli Zhou "Analysis and amendment of flow control credit-based in SAN extension", Proc. SPIE 6022, Network Architectures, Management, and Applications III, 602237 (5 December 2005); https://doi.org/10.1117/12.634330

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