Using a SAN in conjunction with an ESXi host differs from traditional SAN usage in a variety of ways.
When you use SAN storage with ESXi, keep in mind the following considerations:
You cannot use SAN administration tools to directly access operating systems of virtual machines that use the storage. With traditional tools, you can monitor only the VMware ESXi operating system. You use the vSphere Web Client to monitor virtual machines.
The HBA visible to the SAN administration tools is part of the ESXi system, not part of the virtual machine.
Typically, your ESXi system performs multipathing for you.