Cisco MDS 9000 Series Troubleshooting Guide

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5-48
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
Forwarding mode: pass-thru
5 minutes input rate 410824 bits/sec, 51353 bytes/sec, 1069 frames/sec
5 minutes output rate 581291520 bits/sec, 72661440 bytes/sec, 53302 frames/sec
iSCSI statistics
1072393 packets input, 51482588 bytes
1072305 Command pdus, 0 Data-out pdus, 0 Data-out bytes, 0 fragments
53430805 packets output, 72837086312 bytes
1072273 Response pdus (with sense 9), 0 R2T pdus
52358444 Data-in pdus, 70272402880 Data-in bytes
MDS_BOTTOM# show iscsi remote initiator iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas
iscsi tcp
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 20:00:00:0c:30:57:5e:c2 (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
iSCSI session details
Target node:
Statistics:
PDU: Command: 0, Response: 0
Bytes: TX: 0, RX: 0
Number of connection: 1
TCP parameters
Local 10.48.69.250:3260, Remote 10.48.69.233:1026
Path MTU: 1500 bytes
Retransmission timeout: 300 ms
Round trip time: Smoothed 150 ms, Variance: 31
Advertized window: Current: 998 KB, Maximum: 1000 KB, Scale: 4
Peer receive window: Current: 1000 KB, Maximum: 1000 KB, Scale: 4
Congestion window: Current: 12 KB
VSAN ID 777, FCID 0x610001
No. of FC sessions: 1
No. of iSCSI sessions: 1
iSCSI session details
Target node: shark_nas
Statistics:
PDU: Command: 392051, Response: 392042
Bytes: TX: 25692593152, RX: 0
Number of connection: 1
TCP parameters
Local 10.48.69.250:3260, Remote 10.48.69.233:1057
Path MTU: 1500 bytes
Retransmission timeout: 300 ms
Round trip time: Smoothed 2 ms, Variance: 1
(Watch out for these numbers. The above output is for a TCP session that goes only through one Gigabit
Ethernet switch. When there are multiple router hops, as well as WAN links in the middle, the RTT will
grow, and the variance will fluctuate with higher values. You may need to adjust the Retransmission
timeout.)
Advertized window: Current: 1000 KB, Maximum: 1000 KB, Scale: 4
(This is the window size set on the Windows Client. See Figure 5-15.)
Peer receive window: Current: 1000 KB, Maximum: 1000 KB, Scale: 4

Cisco MDS 9000 Series Specifications

General

Category	Switch
Operating System	Cisco NX-OS
Ports	Varies by model
Protocols	Fibre Channel (FC), Fibre Channel over IP (FCIP), iSCSI
Redundancy	Redundant supervisors, power supplies, and fans
Management	Cisco Data Center Network Manager (DCNM), CLI, SNMP
Virtualization Support	VSANs (Virtual SANs)
Security Features	Fibre Channel Security Protocol (FC-SP)
Hot Swappable Components	power supplies, fans
Power Supply Options	AC and DC options available