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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: Questions about FCIPKavi: We will be discussing your second item in the upcoming interim meeting on -----Original Message----- From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of Kavi, Prabhu Sent: Monday, January 08, 2001 10:08 AM To: 'ips@ece.cmu.edu' Subject: Questions about FCIP I have some questions about the Fibre Channel over TCP/IP I-D. I understand IP networks well, but am a Fibre Channel newbie and am asking these questions to learn more about Fibre Channel's requirements rather than to challenge the document. Here are my questions: 1. Why Fibre Channel over TCP, rather than over UDP? Is it because of an expectation of lossy IP networks? Or is it equally valid to put Fibre Channel over UDP (and therefore can be the subject of another I-D). 2. What are the typical values of the ED_TOV and R_A_TOV timers? Do I understand this right to say that these timers effectively limit the latency across the IP network? 3. What is an acceptable loss ratio of Fibre Channel datagrams that still allows the SAN devices to deliver appropriate end user performance (order of magnitude estimate is sufficient). The reasons I ask are: * I believe it is invalid to assume that IP networks are necessarily more lossy than Fibre Channel networks. A well-engineered IP network, using a combination of both Diff-Serv and MPLS, can achieve (close to) zero loss. * Stacking one reliable delivery protocol on top of another can possibly lead to interesting performance problems after a loss occurs, depending upon the timer values for TCP and Fibre Channel. Thanks in advance for your answers. Prabhu Kavi ---------------------------------------------------------------------- Prabhu Kavi Phone: 1-978-264-4900 x125 Director, Adv. Prod. Planning Fax: 1-978-264-0671 Tenor Networks Email: prabhu_kavi@tenornetworks.com 100 Nagog Park WWW: www.tenornetworks.com Acton, MA 01720
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