HP 8/20q HP StorageWorks 8/20q Fibre Channel Switch QuickTools Switch Manageme - Page 61
Fabric device management interface, Advanced switch properties
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Fabric device management interface Fabric Device Management Interface (FDMI) provides a means to gather and display device information from the fabric and allows FDMI-capable devices to register certain information with the fabric, when FDMI is Enabled. QuickTools reports any and all FDMI information reported by the entry switch, if FDMI is enabled on the entry switch. To view FDMI data, FDMI must be enabled on the entry switch and on all other switches in the fabric which are to report FDMI data. FDMI is comprised of the fabric-to-device interface and the application-to-fabric interface. The fabric-to-device interface enables a device's management information to be registered. The application-to-fabric interface provides the framework by which an application obtains device information from the fabric. Use the FDMI HBA Entry Limit field on the Switch Properties dialog box to configure the maximum number of HBAs that can be registered with a switch. If the number of HBAs exceeds the maximum number, the FDMI information for those HBAs can not be registered. Select the FDMI Enabled option on the Switch Properties dialog box to Enable or Disable FDMI. If FDMI is Enabled on an HBA, the HBA forwards information about itself to the switch when the HBA logs into the switch. If FDMI is Enabled on a switch, the switch stores the HBA information in its FDMI database. Disabling FDMI on a switch clears the FDMI database. If you Disable FDMI on a switch and then re-enable it, you must reset the ports to cause the HBAs to log in again, and thus forward HBA information to the switch. To view detailed FDMI information for a device, click the Devices tab, and click (i) in the Details column of the Devices data window. The Detailed Devices Display dialog box displays the specific information for that device. See "Devices data window" (page 31) for more information. Advanced switch properties The Advanced Switch Properties dialog box (Figure 28) enables you to set the timeout values. The dialog box is available for only the entry switch. The switch is automatically taken offline temporarily while the timeout values are being set and will be restored to its original state after the changes are complete. To open the Advanced Switch Properties dialog box, open the Switch menu and select Advanced Switch Properties. After making changes, click OK to put the new values into effect. Figure 28 Advanced Switch Properties dialog box Timeout values The switch timeout values determine the timeout values for all ports on the switch. The timeout values must be the same for all switches in the fabric. • R_A_TOV (Resource Allocation Timeout)-The maximum time a frame could be delayed and still be delivered. The default is 10000 milliseconds. • E_D_TOV (Error Detect Timeout)-The maximum round trip time that an operation between two N_Ports could require. The default is 2000 milliseconds. IMPORTANT: Mismatched timeout values disrupt the fabric. These should not be changed unless absolutely necessary. The switch is temporarily placed offline to change these values. HP StorageWorks 8/20q Fibre Channel Switch QuickTools Switch Management User Guide 61