However, from a capacity tier perspective, while NVMe devices are fully supported as capacity devices, VMware is currently working on specific enhancements to optimize NVMe devices. This is especially true for the destaging process, where data is moved from the cache tier to the capacity tier. Thus, at the time of writing, readers should not expect vastly significant performance improvements when comparing NVMe devices to other flash devices when they are used for the capacity tier. We expect this to change significantly in future versions of vSAN.