Cisco MDS 9000 Series Troubleshooting Manual page 144

Fine Tuning/Troubleshooting IPS iSCSI TCP Performance
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 .
5 minutes input rate 3957384 bits/sec, 494673 bytes/sec, 6716 frames/sec
5 minutes output rate 609420144 bits/sec, 76177518 bytes/sec, 53267 frames/sec
6979248 packets input, 514206826 bytes
55551272 packets output, 79456286344 bytes, 0 underruns
MDS_BOTTOM# show interface fc 1/3
fc1/3 is up
Hardware is Fibre Channel
Port WWN is 20:03:00:0c:30:57:5e:c0
Admin port mode is auto, trunk mode is on
Port mode is F, FCID is 0x610000
Port vsan is 777
Speed is 1 Gbps
Transmit B2B Credit is 64
(This depends on the storage device; it can not be changed.)
Receive B2B Credit is 64
(This is the switch's receive; the default is 16 for F/FL ports.)
Receive data field Size is 2112
Beacon is turned off
5 minutes input rate 524947584 bits/sec, 65618448 bytes/sec, 49382 frames/sec
5 minutes output rate 470432 bits/sec, 58804 bytes/sec, 988 frames/sec
MDS_BOTTOM# show ips stats tcp interface gigabit 2/1 detail
TCP Statistics for port GigabitEthernet2/1
TCP send stats
(The lower the better. Increasing values would show that the IP network in the middle has issues, or that
the TCP peer has problems ACK'ing the data that IPS sends to it.)
(Packets Split shows the IP level fragmentation; would increase if the MTU of this interface is higher
than the MSS of the iSCSI client; for example, client MTU default 1500 => MSS=1460, but IPS Gigabit
MTU changed to 2500).)
TCP receive stats
Cisco MDS 9000 Family Troubleshooting Guide
5-50
0 multicast frames, 0 compressed
0 input errors, 0 frame, 0 overrun 0 fifo
0 output errors, 0 collisions, 0 fifo
0 carrier errors
64560099 frames input, 85630621884 bytes
0 discards, 3 errors
0 CRC, 0 unknown class
0 too long, 0 too short
1291861 frames output, 76739928 bytes
0 discards, 0 errors
0 input OLS, 0 LRR, 0 NOS, 0 loop inits
3 output OLS, 3 LRR, 0 NOS, 2 loop inits
56252632 segments, 76746280484 bytes
56100434 data, 152173 ack only packets
1 control (SYN/FIN/RST), 0 probes, 24 window updates
0 segments retransmitted, 0 bytes
0 retransmitted while on ethernet send queue, 0 packets split
3 delayed acks sent
7068115 segments, 1061853 data packets in sequence, 54245464 bytes in sequence
0 predicted ack, 187 predicted data
0 bad checksum, 0 multi/broadcast, 0 bad offset
0 no memory drops, 0 short segments
0 duplicate bytes, 0 duplicate packets
0 partial duplicate bytes, 0 partial duplicate packets
0 out-of-order bytes, 0 out-of-order packets
0 packet after window, 0 bytes after window
0 packets after close
7067879 acks, 76746255713 ack bytes, 0 ack toomuch, 21 duplicate acks
0 ack packets left of snd_una, 0 non-4 byte aligned packets
Chapter 5 Troubleshooting IP Storage Issues
OL-5183-02, Cisco MDS SAN-OS Release 1.3