After you enable vSAN, a single datastore is created. You can review the capacity of the vSAN datastore.
Activate vSAN and configure disk groups.
- Navigate to Storage in the vSphere Web Client.
- Select the vSAN datastore.
- Click the Configure tab.
- Review the vSAN datastore capacity.
The size of the vSAN datastore depends on the number of capacity devices per ESXi host and the number of ESXi hosts in the cluster. For example, if a host has seven 2 TB for capacity devices, and the cluster includes eight hosts, the approximate storage capacity is 7 x 2 TB x 8 = 112 TB. When using the all-flash configuration, flash devices are used for capacity. For hybrid configuration, magnetic disks are used for capacity.
Some capacity is allocated for metadata.
On-disk format version 1.0 adds approximately 1 GB per capacity device.
On-disk format version 2.0 adds capacity overhead, typically no more than 1-2 percent capacity per device.
On-disk format version 3.0 and later adds capacity overhead, typically no more than 1-2 percent capacity per device. Deduplication and compression with software checksum enabled require additional overhead of approximately 6.2 percent capacity per device.
What to do next
Create a storage policy for virtual machines using the storage capabilities of the vSAN datastore. For information, see the vSphere Storage documentation.