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Performance Tuning
2-4 SN0051103-00 A
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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.
Performance Tuning
Proper configuration maximizes the router’s performance. Knowing the round trip
delay (distance between the router and iSCSI initiators) and WAN effective data
rate (connection type) allows you to tune the router for optimal performance. The
following tables provide TCP Window Size settings for specific WAN
environments. The TCP Window Size is configured as two parameters: Window
Size and Scaling Factor. See the iSR6200 Router Manager User's Guide and the
iSR6200 Router CLI User's Guide for configuring the TCP window size.
Table 2-1. T1: 1.554 Mbits/Sec
Round Trip Delay (ms) TCP Window Size (kBytes)
<= 41.5 8
<= 82.9 16
<= 165.8 32
<= 331.6 64
<= 663.2 128
<= 1326.5 256
<= 2652.9 512