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2–Planning
iSCSI Performance
ISR651101-00 J 2-3
Each Fibre Channel port is supported by a data buffer with a three-credit capacity;
that is, three maximum-sized frames. For fibre optic cables, this enables full
bandwidth over approximately 2.5 kilometers at 2Gbps (1.2 credits/Km).
Beyond these distances, however, the connection loses some efficiency because
the transmitting port must wait for an acknowledgement before sending the next
frame.
Bandwidth
Bandwidth is a measure of the volume of data that can be transmitted at a specific
transmission rate. A 2Gbps Fibre Channel port can transmit or receive at nominal
rates of 2Gbps, depending on the device to which it is connected. This
corresponds to actual bandwidth value of 212MB.
Latency
Latency is a measure of how fast a transaction travels through the router.
iSCSI Performance
The iSR6200 router supports Ethernet service at transmission rates of 1000Mbps,
100Mbps, or 10Mbps with an MTU size of 1500 or 9000 (jumbo frames).
Related performance characteristics include the following:
Distance
Bandwidth
Latency
Distance
Consider the physical distance between routers.This is usually measured in
round-trip delay. Round-trip delays range anywhere from less than 1 millisecond
to as great as 250 milliseconds.
Bandwidth
Bandwidth is a measure of the volume of data that can be transmitted at a specific
transmission rate. WAN data rates range from 1.5 megabits per second (T1) to
greater than 600 megabits per second (OC-12).
NOTE
An MTU size greater than 1500 should only be used when the router is
connected to a 1000Mbps Ethernet network.