iSR6200 Intelligent Storage Router Installation Guide - QLogic

2–PlanningiSCSI PerformanceBandwidthBandwidth is a measure of the volume of data that can be transmitted at a specifictransmission rate. A 2Gbps Fibre Channel port can transmit or receive at nominalrates of 2Gbps, depending on the device to which it is connected. Thiscorresponds to actual bandwidth value of 212MB.LatencyLatency is a measure of how fast a transaction travels through the router.iSCSI PerformanceThe iSR6200 router supports Ethernet service at transmission rates of 1000Mbps,100Mbps, or 10Mbps with an MTU size of 1500 or 9000 (jumbo frames).NOTE:An MTU size greater than 1500 should only be used when the router isconnected to a 1000Mbps Ethernet network.DistanceBandwidthRelated performance characteristics include the following:• Distance• Bandwidth• LatencyConsider the physical distance between routers.This is usually measured inround-trip delay. Round-trip delays range anywhere from less than 1 millisecondto as great as 250 milliseconds.Bandwidth is a measure of the volume of data that can be transmitted at a specifictransmission rate. WAN data rates range from 1.5 megabits per second (T1) togreater than 600 megabits per second (OC-12).LatencyLatency is a measure of how fast a transaction travels through the router and LANor WAN.ISR651101-00 G 2-3