The Datastore Allocation Analysis pie chart displays the capacity distribution on all the Datastores present in the Data Center based on their usage statistics. The allocation is done based on the vDisk state.
To see Datastore allocation details:
Click any section of the pie chart to see the details of vDisks included in that particular section.
A pop-up window opens, which displays the vDisk name, size, and the Datastore with which the vDisk is associated.