Cisco MDS 9000 Series

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5-53
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
Statistics:
PDU: Command: 11, Response: 11
Bytes: TX: 2152, RX: 0
Number of connection: 1
TCP parameters
Local 10.48.69.250:3260, Remote 10.48.69.233:1040
Path MTU: 2440 bytes
Retransmission timeout: 370 ms
Round trip time: Smoothed 47 ms, Variance: 81
Advertized window: Current: 999 KB, Maximum: 1000 KB, Scale: 4
Peer receive window: Current: 1024 KB, Maximum: 1024 KB, Scale: 4
Congestion window: Current: 12 KB
MDS_Top# show iscsi remote-node fcp-session-detail
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:30:6c:24:42 (dynamic)
Member of vsans: 777, 778
Number of Virtual n_ports: 1
Virtual Port WWN is 20:00:00:0c:30:6c:24:42 (configured)
Interface iSCSI 2/1, Portal group tag is 0x1001
VSAN ID 0, FCID 0x 0
No. of FC sessions: 1
No. of iSCSI sessions: 1
FCP Session details
Target FCID: 0x000000 (S_ID of this session: 0x000000)
pWWN: 00:00:00:00:00:00:00:00
nWWN: 00:00:00:00:00:00:00:00
Session state: INIT
1 iSCSI sessions share this FC session
Target:
Negotiated parameters
RcvDataFieldSize 2048 our_RcvDataFieldSize 2048
MaxBurstSize 0, EMPD: FALSE
Random Relative Offset: FALSE, Sequence-in-order: Yes
Statistics:
PDU: Command: 0, Response: 0
VSAN ID 777, FCID 0x700003
No. of FC sessions: 1
No. of iSCSI sessions: 1
FCP Session details
Target FCID: 0x700000 (S_ID of this session: 0x700003)
pWWN: 50:05:07:63:00:c4:94:4c
nWWN: 50:05:07:63:00:c4:94:4c
Session state: LOGGED_IN
1 iSCSI sessions share this FC session
Target: shark_nas
Negotiated parameters
RcvDataFieldSize 2048 our_RcvDataFieldSize 2048
MaxBurstSize 0, EMPD: FALSE
Random Relative Offset: FALSE, Sequence-in-order: Yes
Statistics:
PDU: Command: 0, Response: 11
To get the real benefit of this increased MTU and higher FC Frame Size, the path between the iSCSI
client and the IPS iSCSI interface (as well as the host NIC) has to be capable of supporting this high
MTU.