The Space Utilization by Datastores chart displays the amount of space used by a virtual machine on different datastores in the data center.
The Space Utilization by Datastores chart is located in the Storage view of the virtual machine Performance tab.
|datastore_name||Amount of disk space in the datastore currently in use by the virtual machine.
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. You can provision more space to the datastore if possible, or you can add disks to the datastore or use shared datastores.
If snapshot files are consuming a lot of 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 Web Client user interface. For information about consolidating the data center, see the vSphere documentation.