S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 20 Troubleshooting IP Storage Services
iSCSI TCP Performance Issues
Figure 20-14
Congestion Window: Current: 24 kB
TCP Parameter Changes
To change TCP parameters in the Windows registry, use the registry parameters shown in
Figure 20-14
as an example.
Setting the Tcp1323Opts (circled in green) to 3, sets two bits on, one for window scaling and the other
for the time-stamp option. We are only interested in the window scaling here.
Caution
Editing the registry is a very high risk operation, it can render the system unusable, requiring a
reinstallation of the entire operating system. Only advanced users should perform this operation.
Displaying the Gigabit Ethernet Interface
Choose
Switches > Interfaces > Gigabit Ethernet
using Fabric Manager to view the Gigabit Ethernet
status.
Or use the
show interfac
e CLI command to view the Gigabit Ethernet status (see
Example 20-2
).
Example 20-2 Annotated Output of show interface gigabitethernet CLI Command
MDS_BOTTOM#
show interface gigabitethernet 2/1
GigabitEthernet2/1 is up
Hardware is GigabitEthernet, address is 0005.3000.a85a
Internet address is 10.48.69.251/26
MTU 1500 bytes
, BW 1000000 Kbit
Port mode is IPS
Speed is 1 Gbps
Beacon is turned off
5 minutes input rate 3957384 bits/sec, 494673 bytes/sec, 6716 frames/sec
