Iscsi Listener Port; Tcp Tuning Parameters - Cisco DS-X9530-SF1-K9 - Supervisor-1 Module - Control Processor Configuration Manual

Configuring iSCSI
S e n d d o c u m e n t a t i o n 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 .
These two features help reduce I/O time for small write commands because it removes one round-trip
between the initiator and the target for the R2T PDU. As an iSCSI target, the MDS switch allows up to
64 KB of unsolicited data per command. This is controlled by the FirstBurstLength parameter during
iSCSI login negotiation phase.
If an iSCSI initiator supports immediate data and unsolicited data features, these features are
automatically enabled on the MDS switch with no configuration required.
iSCSI Interface Advanced Features
Advanced configuration options are available for iSCSI interfaces on a per-IPS port basis. These
configurations are similar to the advanced FCIP configurations and are already explained in that section
(see the
To access these commands from the iSCSI interface, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface iscsi 4/1
switch(config-if)#
Cisco MDS switches support the following advanced features for iSCSI interfaces.

iSCSI Listener Port

You can configure the TCP port number for the iSCSI interface which listens for new TCP connections.
The default port number is 3260. Once you change the TCP port number, the iSCSI port only accepts
TCP connections on the newly configured port.
See the

TCP Tuning Parameters

You can configure the following TCP parameters.
•
Cisco MDS 9000 Family Configuration Guide
35-26
"Advanced FCIP Interface Configuration" section on page
"Configuring TCP Listener Ports" section on page
The minimum retransmit timeout, keepalive timeout, maximum retransmissions, path MTU, SACK
(SACK is enabled by default for iSCSI TCP configurations), window management (The iSCSI
defaults are max-bandwidth = 1G, min-available-bandwidth = 70 Mbps, and round-trip-time =1
ms.), buffer size (default send buffer size for iSCSI is 4096 KB), window congestion (enabled by
default and the default burst size is 50 KB), and maximum delay jitter (enabled by default and the
default time is 500 microseconds.).
See the "Minimum Retransmit Timeout" section on page
page 33-8, "Maximum Retransmissions" section on page
"Monitoring Congestion" section on page 33-10
page 33-11.
33-12).
Purpose
Enters configuration mode.
Selects the iSCSI interface on the switch.
33-7)
33-8, "Keepalive Timeout" section on
33-9, "Path MTUs" section on page
and "Estimating Maximum Jitter" section on
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Chapter 35 Configuring iSCSI
33-9,