ALR0530W The Cache Holding Time of controller controller name in storage system storage system name was measured to be measured values, which violated the warning-idle boundary value of boundary values.
Explanation
Cache Holding Time measures the average amount of time that data remains available in controller cache, in seconds. Shorter time periods indicate adverse performance. 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 in the storage system has a Cache Holding Time value that is greater than or equal to the warning-idle boundary, but less 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. This can happen if the application(s) using the controller stopped working properly.
This type of threshold boundary should only be defined if the workload for the controllers 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 increasing the boundary value in the threshold definition, or disabling the boundary check by leaving the boundary value blank.