So, I am in the process of building out a iSCSI system based off freeNAS. This is being connected to a few (around 20ish) ESXi 5.5 boxes. These ESXi boxes only have the boot drive and a few Gb of local storage (something like 30gb SSD's). I am in the process of upgrading the network, and I am finding that there are little to no options for iSCSI between 1Gb/s and 10Gb/s. There has been talk of a 10GB/s backbone to the distribution switch, however that is still not fast enough. I have looked into fiber channel, however it seems to be unsupported by freeNAS until the next release.
Any suggestions for a iSCSI medium between 1Gb/s and 10Gb/s ?