ALR0563E The Back-end Read Response Time of array or MDisk array or MDisk name in storage system storage system name was measured to be measured value ms/op, which violated the defined critical-idle boundary value of boundary value ms/op.
Explanation
Back-end Read Response Time measures the average number of milliseconds that it took to service each read operation for arrays and MDisks. 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 or MDisk in the storage system has a Back-end Read Response Time that is less than or equal to the critical-idle boundary that was defined for the related threshold.
Action
The threshold violation might indicate an unexpected drop in the workload for this array or MDisk. This can happen if the application(s) using the array or MDisk stopped working properly.
This type of threshold boundary should only be defined if the workload for the arrays or MDisks in a storage system are guaranteed to always remain at a certain minimum level. Otherwise IBM Spectrum Control might recognize many violations, even though there is really no underlying problem with the applications. In these situations, consider decreasing the boundary value in the threshold definition, or disabling the boundary check by leaving the boundary value blank.