User's Manual

5 – Managing Ports
Configuring Ports
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5.2.4
I/O Stream Guard
The I/O Stream Guard feature suppresses the generation of Registered State
Change Notification (RSCN) messages on a port basis. I/O Stream Guard should
be enabled only on ports connected to initiator devices. To configure the I/O
Stream Guard option using the Port Properties dialog, open the Port menu, and
select Port Properties. Click the radio button that corresponds to one of the
following options:
 Enable: Suppresses the reception of RSCN messages from other ports for
which I/O Stream Guard is enabled.
 Disable: Allows free transmission and reception of RSCN messages.
 Auto: Suppresses the reception of RSCN messages under the following
conditions:
 The port is connected to an initiator device with a QLogic HBA.
 The Scan Device option is enabled.
5.2.5
Scan Device
The Device Scan feature queries the connected device during login for FC-4
descriptor information. Disable this parameter only if the scan creates a conflict
with the connected device.
GL_Port Generic loop port - Self discovers as an F_Port, FL_Port, or an E_Port.
GL_Port is the default port type. A single device on a public loop will
attempt to configure as an F_Port first, then if that fails, as an FL_Port.
1-Gbps/2-Gbps only.
Donor Donor port - Allows buffer credits to be used by another port.
1-Gbps/2-Gbps only.
Table 5-9. Port Types
State Description