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3 – Planning
Performance Tuning
3-4 FI0154601-00 C
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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 page 7-28 and page A-33 for configuring the TCP
window size.
Table 3-1. T1 / DS-1: 1.554 Mbits/Sec
Round Trip
Delay (ms)
TCP Window
Size (bytes)
SANbox 6140
Window Size
SANbox 6140
Scaling
Factor
250 64 K 32K 1
100 32 K 32K 0
50 32 K 32K 0
25 32 K 32K 0
20 32 K 32K 0
15 32 K 32K 0
10 32 K 32K 0
5 32 K 32K 0
2.5 32 K 32K 0
1 or less 32 K 32K 0
Table 3-2. T3 / DS-3: 45 Mbits/Sec
Round Trip
Delay (ms)
TCP Window
Size (bytes)
SANbox 6140
Window Size
SANbox 6140
Scaling
Factor
250 1 MB 32K 5
100 512 K 32K 4
50 256 K 32K 3
25 128 K 32K 2
20 128 K 32K 2