I haven't figured out how I'm going to best take advantage of this technology.  Has anybody experimented with block sizes to find a sweet spot for mixed workloads? Most of our VM's are windows probably with the majority having drives formatted default 4k. We do have quite a few SQL vm's with 8 to 64k block sizes. Our backend storage is currently VNX with Fast Cache. The SSD's we have in our new esx boxes are SAS attached which I know are not the fastest out there but I'm hoping we can see some benefit properly done. Thanks for any thoughts.