ALR0594W The Non-preferred Node Usage Percentage of I/O Group I/O Group name in device device name was measured to be measured value%, which violated the warning-idle boundary value of boundary value%.

Explanation

Non-preferred Node Usage Percentage measures the approximate percentage of I/O operations that are not directed against the preferred node for each volume in an I/O Group. There is a small performance penalty when I/O does not go to the preferred node for each volume. 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 I/O Group in the storage system has a Non-preferred Node Usage 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.