Rick Schlander from VMBulletin writes about VMworld:
Infinio is a VMware only — NAS offload engine. It is an in-memory software cache that is intelligent enough to figure out what data is accessed and when so that it minimizes on the read/write impact on your storage array. The product (as of this posting) is a 2 vCPU / 8GB RAM virtual appliance and acts as an accelerator that talks to your NAS directly. It uses a cache pool that the entire VMware cluster shares and it leverages to deal with service vMotions and host failures. When this occurs, the host cache will act locally and stop using the pool from neighboring ESX hosts.
Infinio has some really exciting technology that you should check out if you want to accelerate your VM performance.