Home > Storage > PowerVault > Guides > Dell PowerVault ME5 Series: VMware vSphere Best Practices > Introduction
PowerVault ME5 storage supports and is certified with VMware vSphere for server connectivity with iSCSI (10/25 Gb, direct-attached, and SAN-attached), Fibre Channel (16/32 Gb, direct-attached, and SAN-attached), and direct-attached SAS. While you can configure the PowerVault ME5012 or PowerVault ME5024 array with a single controller, for maximum storage availability and performance, it is a best practice to use dual-controller configurations. A dual-controller configuration improves application availability because in the event of a controller failure, the affected controller fails over to the partner controller with little interruption to data flow. You can replace a failed controller without having to shut down the storage system.