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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Performance of iSCSI, FCIP and iFCPVi, thanks for your comments. Indeed, there is no such limitation in the FCIP ID. But there is no consideration for multiple TCP connections either. What specifically governs the use of TCP flow A as opposed to TCP flow B when two FCIP gateways are communicating? As we've seen in our examples, the performance is significantly (quadratically) impacted by the choice of number of TCP connections. Fine-grain control over multiple TCP connections thus becomes mandatory between any two FC islands of non-trivial size. The most natural way to multiplex storage connections (FC or SCSI) on multiple TCP connections is to have one or a few TCP connections per storage connection, that is, to use storage connection awareness for assigning TCP connections to storage connections (iSCSI, iFCP). Surely, it is possible to multiplex storage connections into TCP connections without any knowledge of the identity of storage connections. But this brings up issues including load balancing, interdependency between storage connections sharing TCP connections, managing storage connections that are striped across TCP connections (as thoroughly discussed within the iSCSI community). It seems that the iSCSI and iFCP solution of assigning one (or a few) TCP connection(s) for each storage connections has many practical and performance merits that needs a special attention in FCIP also. Again, any comments are very welcome. Victor Firoiu ----- Content Internetworking Lab, Technology Center Nortel Networks, Inc. 600 Technology ParkBillerica, MA 01821 USA Vi Chau wrote: > > Hi, > > There is nothing in the FCIP I-D that limits the > tunnel between the SAN islands to one TCP connection. The > FCIP gateways can open as many TCP connections as it can > support to reach any number of destination gateways. > > Vi Chau > Gadzoox Networks, Inc. > 16241 Laguna Canyon Road, Suite 100 > Irvine, CA 92618-3611 > 949-789-4639 >
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