Home > Storage > PowerVault > Guides > Dell PowerVault ME5 Series: Microsoft Hyper-V Best Practices > Clustering and Boot from SAN
Boot from SAN is not preferred for large Hyper-V clusters on PowerVault.
Hosts that are configured to boot from SAN cannot be assigned to a host group in PowerVault Manager. However, cluster volumes can still be mapped to a group of clustered Hyper-V nodes in PowerVault Manager, even if they are not in a host group.
After mapping a shared volume to multiple Hyper-V nodes, verify that the LUN number is consistent on all nodes. If the LUN number is not consistent, use PowerVault Manager to change it. Click Edit All and specify the new LUN number. Then click Apply.
Perform a Rescan Disk on the host if the LUN number is changed in PowerVault Manager. If the LUN number does not change on the host after a rescan, reboot the host.
When a volume is mapped to a host group, or a group of hosts in PowerVault Manager, the wizard should assign a consistent LUN ID for all hosts automatically. In this example, a cluster shared volume is mapped to a host group with two member servers. The consistent LUN number is 31 in this example.