iSR6200 Intelligent Storage Router Installation Guide - QLogic

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5–Fibre Channel over IPConfiguring FCIPData 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 to realize the affects of automaticcompression.Bandwidth LimitingThe router provides the ability to set the maximum bandwidth used by an FCIProute. This setting is very important because most WANs do not support the1-gigabit 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.NOTE:The bandwidth parameter should never be set higher than the total WANbandwidth; otherwise, performance suffers due to WAN congestion(dropped packets).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 percent of an OC-3 link (150Mbps link), the route bandwidth setting should beas follows:Bandwidth Allocated = 50% × Link Rate75Mbps = 0.5 × 150MbpsFor 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 RTT.5-14 ISR651101-00 G
5–Fibre Channel over IPConfiguring FCIPTable 5-4. T1 / DS-1—1.554MbpsRound-Trip Time(ms)Window Size(bytes)Scaling Factor(2 n )250 64K 1100 32K 050 32K 025 32K 020 32K 015 32K 010 32K 05 32K 02.5 32K 01 or less 32K 0Table 5-5. T3 / DS-3—45MbpsRound-Trip Time(ms)Window Size(bytes)Scaling Factor(2 n )250 1M 5100 512K 450 256K 325 128K 220 128k 215 64K or 128K 1 or 210 64K 15 32K 02.5 32K 01 or less 32K 0ISR651101-00 G 5-15
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iSR6200Intelligent Storage RouterIn
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Table of ContentsPrefaceIntended Au
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iSR6200 Intelligent Storage RouterI
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PrefaceThis user’s guide describe
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PrefaceDocumentation Conventions•
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PrefaceCommunications StatementsFed
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PrefaceLaser Safety InformationVCCI
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PrefaceTechnical SupportContact Inf
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1 IntroductionThis chapter illustra
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1-IntroductionPower and Cooling Mod
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1-IntroductioniSR6200 Router Blades
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2 PlanningDevicesThis chapter descr
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2-PlanningiSCSI PerformanceBandwidt
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2-PlanningPerformance TuningTable 2
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2-PlanningHigh AvailabilityHigh Ava
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3 InstallationThis chapter describe
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3-InstallationInstalling the iSR620
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Page 57 and 58: 3-InstallationInstalling New Firmwa
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Page 61 and 62: 4 ConfigurationThis chapter describ
Page 63 and 64: 4-ConfigurationEnabling Virtual Por
Page 69 and 70: 4-ConfigurationZoning Virtual Port
Page 71 and 72: 4-ConfigurationZoning Virtual Port
Page 73 and 74: 4-ConfigurationConfiguring Fibre Ch
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Page 77 and 78: 4-ConfigurationConnecting iSCSI Hos
Page 83 and 84: 4-ConfigurationControlling per-Host
Page 91 and 92: 5 Fibre Channel over IPFibre Channe
Page 93 and 94: 5-Fibre Channel over IPConfiguring
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CLog MessagesThis appendix provides
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C-Log MessagesTable C-1. iSR6200 Ro
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IndexAAC power 3-7activity LEDdefin
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Corporate Headquarters QLogic Corpo
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