ALR0521W The Total Data Rate of controller or I/O Group Controller or I/O Group name in storage system storage system name was measured to be measured value MiB/s, which violated the defined warning-stress boundary value of boundary value MiB/s.
Explanation
Total Data Rate measures the average number of mebibytes per second transferred for controllers and I/O Groups. 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.
This message indicates that a threshold boundary violation occurred. In this case, the specified controller or I/O Group in the storage system has a Total I/O Rate 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 the controller or I/O Group is being overloaded with too high a workload. If this is the case, moving some of the controller's or I/O Group's workload to other less busy controllers or I/O Groups might resolve the problem.
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 problem with the workload for the controller or I/O Group. In this case, increase the boundary value in the threshold definition to reduce the number of unnecessary alerts.