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3 – Planning
iSCSI/Gigabit Ethernet Performance
SN0051102-00 A 3-3
A
Distance
Consider the physical distance between Fibre Channel devices. Choose SFP
transceivers that are compatible with the cable type and distance you need.
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 the following approximate distances:
5 kilometers at 1 Gbps (0.6 credits/Km)
2.5 kilometers at 2 Gbps (1.2 credits/Km)
Transmitting data beyond these distances reduces efficiency because the
transmitting port must wait for an acknowledgement before sending the next
frame.
Bandwidth
Bandwidth measures the amount of data transmitted over a channel or network. A
1-Gbps/2-Gbps FC port can transmit or receive at nominal rates of 1- or 2-Gbps,
depending on the device to which it is connected. This corresponds to actual
bandwidth values of 106 MB and 212 MB, respectively. WAN data rates range
from 1.5 Mbps (T1) to greater than 600 Mbps (OC-12).
Latency
Latency measures how long a transaction takes to travel through the router or
over a communication link.
iSCSI/Gigabit Ethernet Performance
The iSR6142 router supports Ethernet service at transmission rates of 1000-, 100-
or 10-Mbps with a MTU size of 1500 or 9000 (jumbo frames).
Related performance characteristics include the following:
Distance
Bandwidth
Latency
NOTE:
An MTU size greater than 1500 should only be used when the router is
connected to a 1000 Mbps Ethernet network.