HP StorageWorks 2.12 Edge Switch - Manual (Page 189)

Optional Features
189 Edge Switch Element Manager User Guide
Set the Congestion Threshold using one of these methods:
— Click the check box under the Use Algorithmic Threshold column to
display a value under the Threshold % column. This value is computed
by the feature’s rerouting algorithm. If you click this check box, you
cannot enter a value into the Threshold % column for the port.
Note: If you clear the check box, any value that was set in the Threshold % column for
the port redisplays.
— Click in the Threshold % column and enter a value in the range of 1
through 99.
Note: You must either specify a value in the Threshold % column or click the Use
Algorithmic Threshold check box.
4. Set Event Notification options. Note that, if enabled, these notifications
occur the first time the events occur. Notifications are not resent while the
problem persists.
— Unresolved Congestion. Click this check box to enable notification. If
enabled, an unresolved congestion entry is made to the Event Log and an
SNMP trap is generated if trap recipients are configured through the
Configure SNMP dialog box.
Note: An unresolved congestion event occurs when the rerouting algorithm cannot find
a path for rerouting data flow and relieving congestion on an ISL.
— Back Pressure. Click this check box to 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 lacks
BB_Credits exceeds the threshold. A separate event also occurs when the
backpressure condition ends.