ESXi 5.5 enable SSD

VMware’s ESXi servers frequently are unable to recognize attached SSD devices, especially when they are behind a RAID controller. If a storage device is not recognized as an SSD, it cannot be designated for vFRC or the Virtual Flash Host Swap Cache function. A set of commands outlined in VMware’s KB 2013188 will mark the storage device as a local SSD and enable the required functionality. If you are up to living dangerously, you can mark any local storage device as an SSD.