After you create a VMFS-based datastore, you can modify it. For example, you can increase it if you need more space. If you have VMFS-2 datastores, you can upgrade them to VMFS-3 format.

Datastores that use the VMFS format are deployed on SCSI-based storage devices.

You cannot reformat a VMFS datastore that a remote host is using. If you attempt to, a warning appears that specifies the name of the datastore in use and the host that is using it. This warning also appears in the VMkernel and vmkwarning log files.

Depending on whether your vSphere Client is connected to a vCenter Server system or directly to a host, different ways to access the Datastore Properties dialog box exist.

vCenter Server only. To access the Datastore Properties dialog box, select the datastore form the inventory, click the Configuration tab, and click Properties.

vCenter Server and ESX host. To access the Datastore Properties dialog box, select a host from the inventory, click the Configuration tab and click Storage. From the Datastores view, select the datastore to modify and click Properties.