ALR0509W The Total Back-end Data Rate of array, MDisk, or MDisk Group Array, MDisk, or MDisk 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 Back-end Data Rate measures the average number of mebibytes per second transferred for arrays, MDisks, and MDisk 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 array, MDisk, or MDisk Group in the storage system has a Total Back-end Data 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 array, MDisk, or MDisk Group is being overloaded with too high a workload. If this is the case, moving some of the array's or MDisk Group's workload to other less busy arrays or MDisk 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 array, MDisk, or MDisk Group. In this case, increase the boundary value in the threshold definition to reduce the number of unnecessary alerts.