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5-45
Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 5 Troubleshooting IP Storage Issues
Fine Tuning/Troubleshooting IPS iSCSI TCP Performance
Figure 5-14 IPS Window Scaling
Lab Setup
This is the lab setup that was used in collecting the performance-related information.
The server was an IBM PentiumIII Server: Dual CPU @ 1.13 Ghz
The
tcp window-size
tcp window-sizetcp window-size
tcp window-size
at both ends was set to 1MB (1024K).
The IBM ESS Shark had a hardcoded B2B value of 64 (not configurable).
The
fcrxbbcredit
fcrxbbcreditfcrxbbcredit
fcrxbbcredit
on the corresponding switch port (fc1/3) was set to the same value.
The C4 and C8 represented the corresponding port WWPNs for the IBM Shark storage subsytem. See
below for full WWPN:
C4
C4C4
C4 Î 50:05:07:63:00:c4:94:4c (in VSAN 778)
C8
C8C8
C8 Î 50:05:07:63:00:c8:94:4c (in VSAN 777)
Configuration from the Bottom MDS
The following example is the configuration for the 9216 switch shown in Figure 5-14.
iscsi initiator name iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas
pWWN 20:05:00:0c:30:6c:24:42
vsan 777
vsan 778
iscsi virtual-target name shark_nas
pWWN 50:05:07:63:00:c8:94:4c fc-lun 0000 iscsi-lun 0000 secondary-pwwn
50:05:07:63:00:c4:94:4c
pWWN 50:05:07:63:00:c8:94:4c fc-lun 0001 iscsi-lun 0001 secondary-pwwn
50:05:07:63:00:c4:94:4c
initiator iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas permit
interface GigabitEthernet2/1
ip address 10.48.69.251 255.255.255.192
iscsi authentication none
Catalyst 6000
2/1
2/1
FC 1/3
FC 1/3
C4
C8
E-ISL
FCP
iSCSI/TCP
ESS 2105/F20
MDS 9216_Bottom
1.1(0.133c)
MDS 9216_Top
1.1(0.133c)
Shark-nas
10.48.69.233
Windows 2000/SP3
Cisco iSCSI - 3.1.1
NIC Alacritech TOE
Driver 5.50
10.48.69.250
94230
FC
FC
HBA
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