HP StorageWorks 2/140 fw 05.01.00 and sw 07.01.00 ha-fabric manager user guide - Page 192
Event Log, Con SNMP, Low BB_Credit Threshold, Default Threshold, Activate, Back Pressure
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Optional Features ■ Back Pressure - Click this check box to display a check mark and enable this option. If enabled, a back pressure entry will be made to the Event Log and an SNMP trap will be generated if trap recipients are configured through the Configure SNMP dialog box. A back pressure event occurs when the percentage of time the ISL has no available BB_Credit exceeds the low BB_credit threshold. A separate event also occurs when the backpressure condition ends. 5. Set the Low BB_Credit Threshold. Note: Using default settings for low BB_Credit threshold should work well in most cases. This step is not required. Note: Earlier versions of this dialog box could display Credit Starvation Threshold instead of Low BB_Credit Threshold. The threshold value is the percentage of time that the transmitting link has no BB_Credit. This value is also used when determining routes for a transmit link. An ISL that has no BB_Credit for longer than this time percentage cannot be the recipient of traffic rerouted from other ISLs. Traffic on this ISL may be rerouted by Open Trunking even if the ISL is not congested. Two options are available: ■ Click Default Threshold and a default value (1 to 99%) appears in the threshold field. If the default is enabled, you cannot enter values into the field. ■ Click in the threshold field and enter a value from 1 to 99. 6. Click Activate to enable these values on the switch and close the dialog box. 192 High Availability Fabric Manager User Guide
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