ALR0626W The Zero Buffer Credit Timer of port port name in storage system storage system name was measured to be measured value microseconds, which violated the defined warning-idle boundary value of boundary value microseconds.

Explanation

Zero Buffer Credit Timer measures the number of microseconds during which it was impossible to send frames due to a lack of buffer credits at the port. Buffer Credit is used as a mechanism to enforce flow-control by the fibre channel protocol, and ensures that a transmitting port which is sending data does not overrun the ability of the receiving port to receive that data. A threshold was defined on this metric, which causes the measured value to be compared to the defined boundaries for each set of performance statistics collected from the storage system or switch.

This message indicates that a threshold boundary violation occurred. In this case, the specified port in the storage system or switch has a Zero Buffer Credit Timer value that is less than or equal to the warning-idle boundary, but greater than the critical-idle boundary that was defined for the related threshold.