The Space allocated by Datastore in GB displays the top 10 datastores, virtual machines in the datastore-cluster with most provisioned space.
This chart is located in the Space view of the Datacenter Performance tab.
|<datastore>||Amount of provisioned storage space on the top 10 datastores with the most provisioned 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.