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20-20
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-6965-03, Cisco MDS SAN-OS Release 2.x
Chapter 20 iSCSI Configuration
Configuring iSCSI
Advanced iSCSI Configuration
Advanced configuration options are available for iSCSI interfaces on a per-IPS port basis.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. Following that, the iSCSI port only
accepts TCP connections on the newly configured port
See the )
• TCP tuning parameters—You can configure the following TCP parameters.
–
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.).
–
QoS—QoS configurations differ for iSCSI and FCIP interfaces.
• Identification of dynamic iSCSI initiator—iSCSI initiators are identified based on their IQN name
or their IP address. In the absence of any configuration for the initiator (WWN or VSAN
membership), the identifier key is the default connection. By default, the key is the IQN name but
can be changed to IP address by toggling this mode.
• Proxy or transparent Initiator—For each iSCSI initiator with iSCSI target sessions, the switch
creates a virtual FC initiator with a distinct pair of WWNs per VSAN. For targets that have access
control per LUN, the WWN pair of each FC initiator must be configured in the target. The proxy
initiator mode can be enabled to facilitate this configuration, in this case, all iSCSI initiators that
connect to this iSCSI interface inherit the same WWN pair and create only one virtual FC initiator
in each VSAN.
Setting the QoS Values
To set the QoS values, follow these steps:
Step 1 In Fabric Manager, select Interfaces > FC Logical from the Physical Attributes pane. You see the
Interface tables in the Information pane.
In Device Manager, select Interfaces > Ethernet or iSCSI. You see the interfaces dialog box.
Step 2 Click the iSCSI TCP tab. You see the iSCSI TCP configuration table.
Step 3 Set the QoS field from 1 to 6.
Step 4 Click the Apply Changes icon in Fabric Manager or click Apply in Device Manager to save these
changes, or click Undo Changes in Fabric Manager or click Cancel in Device Manager to discard
changes.