When you use ESXi with a SAN, certain restrictions apply.

ESXi does not support FC connected tape devices.

You cannot use virtual machine multipathing software to perform I/O load balancing to a single physical LUN.

You cannot use multipathing software inside a virtual machine to perform I/O load balancing to a single physical LUN. However, when your Microsoft Windows virtual machine uses dynamic disks, this restriction does not apply. For information about configuring dynamic disks, see Set Up Dynamic Disk Mirroring.