While technically not part of my vCloud environment, I use an Iomega ix2-200 as my tertiary storage for ISOs used within my vCloud environment. I also use an 8TB iSCSI server that also acts as my RHEV server. I will be upgrading this later as well with a 10G network card and the latest RHEV. However, this is about my Iomega ix2-200.
1TB is just not enough storage.