ESX Server hosts can use multipathing for failover. When one path from the ESX Server host to the SAN becomes unavailable, the host switches to another path. ESX Server hosts can also use multipathing for load balancing. To achieve better load balancing across paths, administrators can specify that the ESX Server host should switch paths under certain circumstances. Different settable options determine when the ESX Server host switches paths and what paths are chosen. Rob Mokkink created a load balancing PowerShel script that spreads even and odd LUN’s over different HBA cards.