Qlogic iSR6200 Installation Manual
Also see for iSR6200: SpecificationsUser guideUser guideUser guideInstallation guide
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5–Fibre Channel Over IPConfiguring FCIP5-14 ISR651101-00 DData CompressionData compression is an option that in some configurations can provide a datathroughput rate greater than the capability of the IP link. The iSR6200 is capableof compressing data at rates up to 190Mbps. The iSR6200 can automaticallyenable or disable compression to achieve maximum throughput on a real-timebasis, depending on the compressibility of the data and the configured bandwidthfor the FCIP route. QLogic recommends that you always enable data compressionand monitor the resulting performance to determine improvement. The FCIP routebandwidth must be correctly configured in order to realize the affects of automaticcompression.Bandwidth LimitingThe router provides the ability to set the maximum bandwidth used by a FCIProute. This setting is very important because most WANs do not support the 1gigabit data rate of the router’s GE ports. Bandwidth limiting is also needed forthose configurations where the FCIP route is only allocated a portion of the totalbandwidth.When a configuration requires that the bandwidth available to the FCIP route be apercentage of the total WAN bandwidth it is important to correctly calculate thebandwidth and set it accordingly. For instance if the FCIP route is being allocated50% of an OC-3 link (150Mb/sec link), the route bandwidth setting should be asfollows:Bandwidth allocated = 50% * Link Rate75Mb/s = 0.5 * 150Mb/secFor more information, see “Configuring an FCIP Route Using the CLI” onpage 5-3.TCP Window SettingsThe TCP window size defines the amount of data sent before seeing anacknowledgement. It is used to avoid overwhelming the receiver and still maintaina constant flow of data. The TCP window size is typically calculated based on theRTT and WAN speed.The following tables show the suggested TCP window size settings for IP linksbased on link speed and round-trip time.NOTE:The bandwidth parameter should never be set higher than the total WANbandwidth, otherwise performance suffers due to WAN congestion (droppedpackets). |
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