Components: This term is used to refer to the virtual machine data files once they have been written to a VSAN datastore. The components include the virtual machine files, any replicas as defined by the vSphere VSAN SPBM, witness components, and metadata. Understanding the number of components required is important, as this impacts on the number of vSphere VSAN hosts that are required.

Data efficiency: A term used by VMware to refer to the deduplication and compression features introduced in version 6.2.

Datastore: A VSAN datastore is similar in appearance to a traditional vSphere datastore, but is created using VSAN disk groups rather than local or remote storage devices.

Disk group: This is a collection of magnetic hard disks and a flash-based storage device within a VSAN cluster.

Network: VSAN uses a vSphere VMkernel network adapter to replicate data between hosts in the VSAN cluster...