VMware Virtual SAN (VSAN) is integrated into the ESXi hypervisor. VSAN virtualizes and aggregates the local direct-attached disks in ESXi hosts. This creates a single pool of storage resources from the local disks with each host that is shared across all hosts in the VSAN cluster, as shown in the following diagram:
![](https://static.packt-cdn.com/products/9781789801514/graphics/assets/b61fb89e-4af9-4f75-b102-d75340e4298c.png)
VSAN diskgroups