The VxFlex OS 2.6 supported VAAI features are: Atomic Test & Set (ATS), Zero Blocks/Write Same, Thin Provisioning in ESXi 5.x and later hosts, Block Delete in ESXi 5.x and later hosts
ScaleIO 1.32 and later were not listed anymore in the VMware Compatibility Matrix because of the proprietary nature of the storage protocol/SDC (non-iSCSI).