ALR0572E The Back-end Write Queue Time of MDisk MDisk name in storage system storage system name was measured to be measured value ms/op, which violated the defined critical-stress boundary value of boundary value ms/op.
Explanation
Back-end Write Queue Time measures the average number of milliseconds that each write operation for an MDisk spent on the queue before being issued to the back-end storage system. 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 MDisk in the storage system has a Back-end Write Queue Time that is greater than or equal to the critical-stress boundary that was defined for the related threshold.
Action
The threshold violation might indicate that a performance problem exists for this MDisk. Either the MDisk is experiencing a hardware or software related problem that is causing a drop in performance, or the MDisk is being overloaded with too high a workload. If the workload is too high, moving some of the MDisk's workload to other less busy MDisks 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 performance problem with the MDisk. In this case, increase the boundary value in the threshold definition to reduce the number of unnecessary alerts.