Re: great if all you run is Oracle
First off your correct, today Oracle does not support VAAI or yet have vcenter integration. But, it has many things to consider for a vmware environment.
1. Dtrace Analytics - The ZFSSA is able to drill down and show you live or historical detailed information about an individual Virtual Machine on VMware. Such as I have 40 vm's running tell me exactly how many IOPS each is doing? How many MB/s? what is the Read/Write ratio, what is the block size?, what is the latency? I can answer these questions and hundreds of others with analytics in mere seconds and for a single virtual machine. Try and do that with your other storage system. By the way these analytics are included and run 24/7.
2. Native 40Gb infiniband - ESXi supports native 40Gb infiniband. You can connect a couple of cables from your esx servers to your ZFSSA and never run out of bandwidth. Furthermore you could connect the whole stack to a mellanox 4036 Grid Director and you wouldn't need any other cables to your esx servers but a few management cables. http://www.mellanox.com/content/pages.php?pg=products_dyn&product_family=108&menu_section=52
3. ZFSSA is fully certified and works extremely well with VMware. You could easily also create Powercli scripts to integrate with snapshots, clones and replication on the ZFSSA array today. Any esx admin worth anything would easily be able to accomplish this with PowerCLI and they would have to pay a storage vendor $$$$$$$ for a GUI that does the same thing.
Regarding Hyper-V: It is fully supported and on the Windows 2008 WHQL. We also have a nice VSS hardware provider that plays well with Hyper-V and Data Protection Manager. Again, not expensive SAN software license required $$$$$$$.
It sounds like you really need a real demo of the ZFSSA so you can see its true capabilities.
Oracle stopped giving away all the intellectual property that Sun gave away so thoughtlessly over a year ago. There are many lines of code and optimization that other ZFS storage vendors will simply never get. You don't see netapp and emc giving away any of their code? There are hundreds of engineers at Oracle working daily to make the ZFSSA one the fastest most stable enterprise storage arrays on the market.