ALR0526W The Write-cache Delay Percentage of controller or node controller or node name in storage system storage system name was measured to be measured value%, which violated the warning-idle boundary value of boundary value%.
Explanation
Write-cache Delay Percentage measures the approximate percentage of I/O operations that were delayed due to write-cache space constraints or other conditions on the controllers and nodes in monitored storage systems. This value represents the average percent of all I/O operations that experienced delays. 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 node in the storage system has a Write-cache Delay Percentage value that is less than or equal to the warning-idle boundary, but greater than 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 controller or node. This can happen if the application(s) using the controller or node stopped working properly.
This type of threshold boundary should only be defined if the workload for the controllers or nodes 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.