Hello,
I would check out http://professionalvmware.com/2013/01/vbrownbag-follow-up-edward-haletky-covering-encryption-up-and-down-the-virtualcloud-stack/ for an idea of how this type of encryption fits into the over all picture of encryption within the stack.
You can also look at the following:
* NetApp
* Brocade Encrypting Fabric Switches
* HighCloud Security
* AFORE
The last two are hardware independent and present as an iSCSI VSA.
You want to encrypt as high up the stack as possible.
Best regards,
Edward L. Haletky
