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3 – Planning
iSCSI Performance
FI0154601-00 C 3-3
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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 given
transmission rate. 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.
Latency
Latency is a measure of how fast a transaction travels through the router.
iSCSI Performance
The SANbox 6140 router supports Ethernet service at transmission rates of
1000-, 100- or 10-Mbps with an MTU size of 1500 or 9000 (jumbo frames).
Related performance characteristics include the following:
Latency
Bandwidth
Latency
Distance
Consider the physical distance between routers.This is usually measured in
round-trip delay. Round trip delays ranges 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 given
transmission rate. WAN data rates range from 1.5 megabits per second (T1) to
greater than 600 megabits per second (OC-12).
Latency
Latency is a measure of how fast a transaction travels through the router and
LAN/WAN.
NOTE:
An MTU size greater than 1500 should only be used when the router is
connected to a 1000 Mbps Ethernet network.