An approach is provided for monitoring disk utilization at an object level. At a first time a first size of an object in a System i computing platform is determined by calling an application programming interface (API). The object is an integrated file system object or a library that includes other objects in the System i platform. At a second time a second size of the object is determined by calling the API. A difference between the first and second sizes is determined. The difference is determined to be greater than a threshold. Based on the difference exceeding the threshold, an alert is sent. The alert indicates the object had a growth in size that exceeds the threshold and indicates the growth at a level of the object, which is different from a growth at a level of an auxiliary storage pool in the System i platform.