Cisco MDS-9124 Troubleshooting Guide - Page 426
show ips stats tcp, Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x, OL-9285-05,
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iSCSI TCP Performance Issues Chapter 20 Troubleshooting IP Storage Services Send documentation comments to [email protected] 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) Interface iSCSI 2/1, Portal group tag: 0x1001 VSAN ID 778, FCID 0x7c0000 VSAN ID 777, FCID 0x610001 MDS_BOTTOM# show iscsi local target: shark_nas Port WWN 50:05:07:63:00:c8:94:4c (This is the port of the Shark connected to MDS 9216_Bottom.) Secondary PWWN 50:05:07:63:00:c4:94:4c (This is the port of the Shark connected to MDS 9216_Top.) Configured node No. of LU mapping: 2 iSCSI LUN: 0000, FC LUN: 0000 iSCSI LUN: 0001, FC LUN: 0001 No. of initiators permitted: 1 initiator iqn.1987-05.com.cisco:02.75af2f95624c.shark-nas is permitted 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 PMTU discover is enabled (default) (This is especially required if there are 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 or capable) even if there are devices without jumbo frame support in the path. Without PMTU discovery, there will be problems.) Keepalive-timeout 60 Initial-retransmit-time 300 (If there is high delay between the peers, this parameter that can be adjusted. There's no real formula; instead 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 output.) Max-retransmissions 8 Window-size 1024000 Sack is enabled 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 20-52 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x OL-9285-05