The Space used by Datastore in GB chart displays the 10 datastores in the data center with the most used disk space.
This chart is located in the Storage view of the Datacenter Performance tab.
|<datastore>||Amount of used storage space on the 10 datastores with the most used space.
The datastore is at full capacity when the used space is equal to the capacity. Allocated space can be larger than datastore capacity, for example, when you have snapshots and thin-provisioned disks. If possible, you can provision more space to the datastore, or you can add disks to the datastore or use shared datastores.
If snapshot files are consuming high datastore space, consider consolidating them to the virtual disk when they are no longer needed. Consolidating the snapshots deletes the redo log files and removes the snapshots from the vSphere Client user interface. For information about consolidating the data center, see the vSphere documentation.