HP 8.20q Fibre Channel Switch - Manual (Page 102)

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I/O Stream Guard
The I/O Stream Guard feature suppresses the 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 box, open the Port menu, and select Port
Properties. Select 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 when the port is connected to an initiator device
with an HBA. The default is Auto. See ” Device Scan ” (page 102).
Device Scan
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.
Auto Performance Tuning and AL Fairness
The Auto Perf Tuning and AL Fairness settings are configured using the Advanced Port Properties dialog
box ( Figure 55 ). The Auto Perf Tuning option enables the switch to dynamically control the MFS_Enable,
VI_Enable and LCF_Enable features based on the operational state of the port. The AL Fairness option
controls how frequently the switch can arbitrate for access. Applies only to ports running in loop (FL) mode.
To open the Advanced Port Properties dialog box, select one or more ports, open the Port menu, and then
select Advanced Port Properties.
Figure 55 Advanced Port Properties dialog box
Resetting a port
The Reset Port option reinitializes the port using the saved configuration. To reset a port:
1. In the faceplate display, select the port(s) to be reset.
2. Select Port > Reset Port.
3. Click Yes to reset the selected port(s).