ALR0609W The Port Send Bandwidth Percentage of port port name in device device name was measured to be measured value%, which violated the warning-stress boundary value of boundary value%.
Explanation
Port Send Bandwidth Percentage measures the approximate bandwidth utilization percentage of the ports in monitored storage systems and switches, based on their current negotiated speed. This value represents the ratio of the current send data rate to the maximum send data rate achievable at the negotiated speed. Since fibre channel protocols are full-duplex, the sum of the send and receive bandwidth percentages can theoretically reach a maximum of 200%. 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 Port Send Bandwidth Percentage value that is greater than or equal to the warning-stress boundary, but less than the critical-stress boundary that was defined for the related threshold.
Action
The threshold violation might indicate that a performance problem exists for this port. Either the port is being overloaded with too high a workload, or there are some congestion or configuration issues in the fabric. If the workload is too high, moving some of the port's workload to other less busy ports might resolve the problem.
If the port's negotiated speed is much less than the physical capability of the port, check the port error metrics which are available for some type of ports, to determine if there are reliability issues with the fabric or the connections. High error counts can indicate hardware problems with some of the ports or switches in the fabric, or can indicate bad cables or connector between some of the ports.
Also be aware that less capable ports at the subsystem or the server HBA or at the switches along the data path may artificially restrict the speed, so communication can only go as fast as the slowest link on the path. It is therefore usually advisable to have only ports with similar capability connected into a fabric.
However this threshold indication is only as good as its defined boundary values. If the specified boundary value is too low, IBM Spectrum Control might recognize many violations, even though there is really no underlying performance problem with the port. In this case, increase the boundary value in the threshold definition to reduce the number of unnecessary alerts.