Cisco MDS 9000 Series Troubleshooting Manual page 141

Chapter 5 Troubleshooting IP Storage Issues
S e n d 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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* this terminal session
MDS_BOTTOM#
MDS_BOTTOM# show iscsi remote
iSCSI Node name is iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas
iSCSI alias name: SHARK-NAS
Node WWN is 20:00:00:0c:30:57:5e:c2 (dynamic)
Member of vsans: 777, 778
Number of Virtual n_ports: 1
Virtual Port WWN is 20:05:00:0c:30:6c:24:42 (configured)
MDS_BOTTOM#
target: shark_nas
Port WWN 50:05:07:63:00:c8:94:4c
(This is the port of the Shark connected to mds_bottom.)
Secondary PWWN 50:05:07:63:00:c4:94:4c
(This is the port of the Shark connected to mds_top.)
Configured node
No. of LU mapping: 2
No. of initiators permitted: 1
all initiator permit is disabled
MDS_BOTTOM#
MDS_BOTTOM# show interface iscsi 2/1
iscsi2/1 is up
Hardware is GigabitEthernet
Port WWN is 20:41:00:0c:30:57:5e:c0
Admin port mode is ISCSI
Port mode is ISCSI
Speed is 1 Gbps
Number of iSCSI session: 2, Number of TCP connection: 2
Configured TCP parameters
Local Port is 3260
(This is especially required if there may be devices without jumbo support in the path. The initial TCP
3-way handshake will establish a session with a high MSS value (provided both the IPS module and the
iSCSI client are configured/capable) even if there are devices without jumbo frame support in the path.
Without PMTU discovery, this will create problems.)
(If there is high delay between the peers, this is one of the parameters that can be adjusted. There's no
real formula, rather use trial and error to find the optimum value for your network. Try lower values as
well as higher ones, and get hints from the show ips stats tcp display.)
OL-5183-02, Cisco MDS SAN-OS Release 1.3
1.1(0.133c) 1.0 20:01:00:0c:30:57:5e:c0 to 20:10:00:0c:30:57:5e:c0
1.1(0.133c) 0.2 20:41:00:0c:30:57:5e:c0 to 20:48:00:0c:30:57:5e:c0
MAC-Address(es)
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00-0b-be-f8-7f-00 to 00-0b-be-f8-7f-04
00-05-30-00-a8-56 to 00-05-30-00-a8-62
Interface iSCSI 2/1, Portal group tag: 0x1001
VSAN ID 778, FCID 0x7c0000
VSAN ID 777, FCID 0x610001
show iscsi local
iSCSI LUN: 0000, FC LUN: 0000
iSCSI LUN: 0001, FC LUN: 0001
initiator iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas is permitted
PMTU discover is enabled (default)
Keepalive-timeout 60
Initial-retransmit-time 300
Max-retransmissions 8
Window-size 1024000
Sack is enabled
Fine Tuning/Troubleshooting IPS iSCSI TCP Performance
Serial-Num
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JAB070804Q3
JAB070205am
Cisco MDS 9000 Family Troubleshooting Guide
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